Well, it really depends on the maintenance item.
I remember when my wife and I were deciding between the Cayman and the 4C back in 2014/2015, when we learned that the subframe bolts need to be inspected on a yearly basis on the 4C, that kind of helped seal the deal for the Cayman. That, and the lack of a manual transmission, plus the fact that our dealer showed us 2 cars that were delivered with body damage from transport.
There are 6 vehicles in the garage that get maintenance performed on them on a regular basis.
I've been wrenching on bikes and cars since I was in my early teens, and I trust my ability to follow instructions and not wreck my vehicles more than I do other people.
The only thing I don't do myself is car tire replacement.
Motorcycle tires, yes. Car tires, no.
I don't mind crawling underneath the 2015 Cayman (58k miles currently) in order to swap out the spark plugs, or change the oil and filter, and I've already swapped brake pads at all 4 corners, and will again sometime in the future, along with rotors, the next time. I also had to take apart the trunk area in order to access the air filters in order to replace them. Plugging the laptop into the Porsche using the Durametric tool is the best way to reset the service light every time it comes up, plus it allows me to access running data if I ever need to troubleshoot something deeper. When I had the '98 Boxster, it came in very handy when I had the CEL light tell me that I had a faulty MAF sensor, and I was able to properly test it, and make sure that I was spending my money on the correct part. The most recent repair to the Cayman was when the front right turn signal bulb burned out. It was actually more work to FIND the bulb in order to purchase it than to actually pull the headlight assembly and replace it.
My 2014 CX-5 has only had me service it in the 80k miles I've owned it. The only work performed by the dealer since the original purchase was when they replaced the rear hatch struts due to recall. I've done every oil change, air filter change, spark plug swap, cabin filter replacement, that the car has ever needed. Only two parts have failed on it: right rear shock sprang a leak, so I replaced the rears with KYB's, and the Shifter Position microswitch needed replacement, which required me taking apart the center console in order to get to it. No big deal with either of those jobs. Most recent service was replacing the rear differential oil, which required me to find a 23mm combination wrench in order to remove the fill plug. I couldn't fit a 23mm socket and wrench into the space between the rear diff and the subframe. I also installed my own trailer hitch and wiring on it back when I first bought it back in 2013, and all that still works flawlessly after all these years.
My wife's 2012 Abarth also has had all of its oil and filter changes performed by me.
The biggest issue is getting my hands down through the small area to pull the cartridge oil filter cap out and back in.
The air filter assembly is kind of a pain in the keister in order to replace the air filter, or access the spark plugs, but I've done both of those jobs, too. Swapped pads and rotors up front a bunch of times (ate the front rotors in about 20k miles, without actually wearing out the brake pads. Never saw that one before). The only actual part that has failed on the Abarth in 37k miles has been the TPMS sensors in the original wheels. 2 out of 4 have failed. First one when the car was under warranty, and a second one last winter. Oh, and it had 1 headlight and one taillight burn out at separate times in its life. The only other problem that the car has had since it was built is something that can't be fixed. Apparently, Italians don't realize that there are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. The clock always runs fast after a month or so. Funny to think that the 2012 500 Sport my wife traded in for the Abarth had a clock that ran slow, instead.
As for the 3 motorcycles in the garage that, 2008 Ducati 848, 2017 Ducati Scrambler Icon, and the 2020 Ducati Supersport I just bought back in October, all of them have had their services performed by yours truly, also. 848 has had plugs, oil changes, air filters, batteries, cam belts, and valve adjustments performed all by me. The dealer has only had to replace the voltage regulator rectifier due to recall, and the low fuel level sensor under warranty in the first two years of its existence. I've swapped out brake pads, and replaced tires front and rear on it. I love my pitbull rear stand more than any other tool in my garage. So much so, I bought the needed fittings so that I could use it on my SuperSport, and on my Hawk GT.
The SuperSport and the Scrambler still haven't reached the mileage points to need any service other than their initial oil and filter changes, but one day, they will. But, the SuperSport has had some money spent on a few items on it. Passenger grab handles were purchased and installed, and then I spent the big bucks on the Ohlins rear shock and mudguard, plus an ABBA bike stand in order to help me install those 2 pieces. Not to mention the 3 different ohlins springs in order to tailor the rear suspension to either my weight, or when my wife and I ride 2 up on it. I can swap out between the Ohlins shock and the OEM shock in about 30 minutes.
So, for maintenance items, tire swaps and alignments are the only regular service items I farm out to actual shops.
That means that I get to buy cars and bikes other people think are too expensive to own due to maintenance costs.
BC.