OP are you implying that the value of gaming hours is the same for every game? For example: 8-15 hours is pretty decent for an average game, but 15 hours in Skyrim is nothing.
Same way I don't go to movies thinking that "...if this doesn't last at least 2 hours minimum I've wasted my money."
Same way I wouldn't buy a shitty game for 60 that lasts 20 hours just because "I'd get some value for my money". :D
So what if the price is 60 dollars now, it will be cheaper in the future, so just deal with it.