For Weekly Rentals, PlayStation Now's Pricing is Reasonable
"...but I will say that, at under a dollar a day, renting these games isn't going to break the bank. Indeed, it seems in line with pricing of rental games from back in the day, and when you take into account all important inflation, that means that renting from Now for a week is actually cheaper than it was at your local video store (this also doesn't take into account the quality of the Now streams, and whether or not they satisfactorily work)...
...Avoid four hour rentals like the plague, and go ahead and plug your PS3 back in if you're not down with weekly rentals, as the prices when you go above that may just recommend buying those games outright.
But seven day rentals? I'm not seeing anything worth worrying about there."