Enh, be careful with that. If you invest money into the library and they jack the price you're gonna either have to suck it up or lose access to everything.
I’m like 90% sure your save data is in tact. You just lose the game. You can buy at a 10% discount via GP if you fear it going away before you are done with it. Or wait for a mega sale. GP users can and still buy games. I myself bought Resident Evil 2 not long ago. GP doesn’t have everything.