I assume by servers you mean SA:MP? Played SA:MP a while ago. I was a mod on a server but left after I leaked a picture of an uppity overweight Admin, everyone set the picture as their wallpaper and uploaded it to the "post your desktop background" thread on the forums.
Anyway, fun fact, I found Crayo when some guy named George came into a server I was on and spammed his forum, I joined for shits and then he sold the forum to Crayo. Just think, if I hadn't gone on that server at that time, I would be free right now.
But OT, most of the servers I've seen are pretty dead at this point. I just checked, and most of the servers with the most amount of players are non-english stunt or roleplaying servers.