12345th - after all these years games rental is still a tiny fraction of shelf space in the video rental store. This is because players use most games for much longer than movies - months rather than days.
A player may use a game for 6 months. With copy software you don't have to use the CD after the initial install and can keep it boxed in pristine condition ready for resale.
Blockbuster have plenty of experience with the rental and resale options. They do both but their pre-played stores (Gamestation in UK) seem to be doing best.