That doesn't make much sense, assuming there's a group of people reviewing games together. The company is going to have to buy the games in that case. The company isn't likely to care much if it's costing $20 or $50. It's nothing compared to the six figure salaries of a game rev.... wait, what? Are you telling me the Coconut Monkey lied to me about how much game reviewers make!? Well, whatever, even at minimum wage the cost of the games is trivial by comparison.
If you take it down to individuals, though, I don't think there's that much difference as long as you have an honest situation going on. The reviewer can see the price just fine and compare it to other games.