I think there are some people who want to be reviewers, but they can't for different reasons. Take me for example:
I'd apply for reviewer but:
-56k modem (I'll get ADSL in a few days so that is no trouble anymore)
-lack time (1/3d of the year I'm off home and I have no valuable computer there)
-lack experience (most important, since my own missions are big crap)
So, there's always an excuse not to apply.
But there's no trouble in waiting...patience is a vertue.