I'm a fan of new play mechanics as well, though not a designer.
I... don't rent games either, unless I have a reason, such as needing to get opinions on a few games quickly.
Reason is, more often then not I want to play the game again later and who knows if i'll find it again?
This happened to me when i was a child, i'd use my allowance to rent a game every weekend and buy candy.
When the store went out of buisness and sold all it's games i couldn't "save" a number of my favorites, that had long since been out of stores since a lot were NES games and it was the SNES era.
I have games i may never get too... but I think i will eventually. That's what retirement homes will be for, when I don't want to play the new fangled videogames i'm sure to hate due to age based bias.... or just being poor and on medicare.
If not though... oh well. It's good to have options.
