This sounds like the darkfall release fiasco, the shop only opening at odd hours and closing in under five min, as well as still having huge server queues.
I think hindering the population is a bad idea.. I can promise you way more then 500 will want to play on release if this game has everything that is being promised.
Also many people wont give a game a second chance.. if they cant buy it when they want too they will never try again, seeing it as if the game doesn't wont my money then ill spend it else wear. This could be devastating to population and to the potential income of Notorious Games leading to the firing of developers and the ultimate closing of the game servers.
So ill say it again, do not limit the amount of people that want to play your game! It will only hurt in the long run.