While I somewhat agree with you about the reviews, even though there's a counterpoint above, how would that still be cheaper?
You rent NBA Live...don't like it, that's 6$. You then rent ESPN and find out you like it better and want to buy it. Already that's 12$. Then you go and buy it, that comes to a total of 32$. (It's normally 20, but if this week..27). And I don't know if you've noticed but 32$ > 20$.