Just wondering, because the member list is just for the people who have accounts here, but what is the actual number of people whitelisted on the build server?
First of all the server has no whitelist. Everybody can join if he or she wants to.
I would say one of the best estimates I can think of is the amount of threads in approved applications, but this is an underestimation because if you were member on RDF then you didn't to apply.