I dont think when most people start a brand new game for the first time that they sit there staring at their screen for the next 5 consecutive hours, no matter how good it is. I usually take breaks, maybe play for 1-2 hours, get something to eat/drink, and come back later. I might also spend the first hour goofing around, getting used to the game, experimenting with the game physics or whatever, looking for bugs. 5 hours is a lot of pressure to immediately get things done. Paying for it is ridiculous. As someone already mention, this is like paying to play a damn demo. Why the hell would I do that?
$5 for 3 days, or maybe even 24 hour pass is more reasonable.