In addition to what Silversword said, I'd also guess the price was a little higher than usual because Rockstar spent a lot of money to make the game. I don't remember the exact number off the top of my head, but I think the article I read said Rockstar spent somewhere around $300 million on the game.
It's a $60 game. Average price. The OP doesn't bother to elaborate, but I can only guess he's referring to it making a billion dollars in less than a week.
Rockstar is a good custodian of their IP's. They haven't fallen prey to the trend of running their IP's into the ground via annualization (q.v.Activision).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.