PCMO is what, $11.70/qt?
Premium is $14.15/qt.
Valvoline R&P is 11.99/qt on the valvoline website, perhaps you can find it cheaper.
You can comfortably run PCMO/Premium at longer intervals than most oils though I don't know if the OCI has been discussed here for VR&P.
In any case, engine oil is cheap compared to the cost of the car, the gas you put in it, the extra money (difference in cost) you spend on HPL vs other oils is literally peanuts since you do it once/twice a year max. It really is cheap.
If your car is worth $5000 then I can see one not spending money on HPL, but $20k and above with the intention of keeping it around? It's a no brainer IMHO.