It's not 50 cents. The game is obviously worth more than that to the people complaining or else they, y'know, wouldn't pay for it.
Unscheduled maintenance isn't something I'm going to lose sleep over, but similarly I don't see why people get so uppity about others wanting compensation for it. Do they ask for more than the problem warrants? Sure, but if it encourages the developers to ensure events like this happen less frequently then how exactly is that a bad thing?