I agree with your view towards proofs and so called collectables in that you pay well over the odds for them and then struggle to sell for spot. They are a scam from the mints to charge you more. Even the mintage is high on them somthey arent even that rare. You'll need a couple of hundred years to pass by before they become valuable from a profit point, but who will be around that long to enjoy any gain?
I agree that to make best buck from proofs etc. you'd need to catch them on release for lowest price then flip them quick when you see demand from the FOMO crowd.
I only stack BU g