While PS+ is a great service and saves consumers a great deal of money, I can't help but feel that there are hidden detrimental ramifications.
If everyone with PS+ hesitated on games released (Until they're on PS+), surely developers would stop making games for said PS systems?
I would prefer that not to happen, as I really do like my PS4/Vita systems. I try to buy games to encourage myself to try new experiences, while hoping that $ spent, encourages developers to continue creating those experiences, on said systems.
It's more about the notoriety your game gets being on PS+, than the actual money. Take Resogun, for example. I'd never heard of Housemarque before their game came out on Plus, now when their next game comes out, I'll remember what I played before and be interested in it. Same for Don't Starve and the incoming sequel.