^ ?? How is lugging internet tires to a place, that much more of a burden than having to drive there anyway to have tire put on? I suppose if they won't fit in the vehicle in one trip, there's that, but most online tire sellers will ship to your choice of installer so at most you might get dirty looks from the installer from your depriving them of the extra profit from a tire sale.
It's totally up to you how much work to put into lengthening your tire life, but it is good to take the wheels off to inspect the brakes and suspension every now and then anyway, so very minimal extra work to just have two off at a time to rotate them.
Buying cheap tires you are more likely to need them rebalanced as they are more likely to be imbalanced in the first place, have a shorter lifespan, and a worse traction to ride quality ratio, so depending on how large the price difference is, they may be a false economy unless you are soon selling the vehicle.
I'm not suggesting that the average daily driver needs high end tires, just that there is a sane middle ground and the same applies to rotation and balancing, that you can get excessive with it but there is still a reasonable need for it rather than never doing it.
Granted I don't rebalance if not getting any vibrations, and if I were, then rotating the tires is a great way to determine if the vibration follows the wheel placement or not.