The Servers (mostly SE1/SE3) are almost every time full when me and my friends have time to play. (afternoon/evening, especially at weekend) And if we are lucky, one of us finally gets in after spam connecting for a long time.
Too many players on the server would take out the fun of bumping into people, Tansien's going to be fixing this issue by bringing in more servers soon.
A queue system would be fucking awesome, but I think that needs some client-side coding as well, so we have to wait for DayZSE.
I'd love to raise the limit to 60 players again, however server performance does not really allow it. We're working on improving it, and once the major hurdles are overcome I'm confident we will be able to raise the limit!