jefequeso: I don't ever underestimate the ignorant desire of certain people to "stick it to the man" when they find a loophole. And in this situation, I'm "the man."
I'm sure it'll happen, but I'm pretty sure it'll be a minority. In Czech Republic, you can return anything purchased online within 14 days after purchase for a full refund - without giving a single reason. While there is abuse of this rule like purchasing a piece of hardware and then returning it after you're done with it, its abuse is so small that the law had not been updated for years. Most people are sensible, and won't even believe that it's worth going trough the entire process for 5-10 bucks.
That does, however, bring up a fairly interesting question - how are the refunds issued? Does Steam withold finances from you for 14 days after every purchase? Does Valve just suck up the expences?