The majority of people like fast leveling servers, and the majority of them are lazy kids, or kids that want everything handed to them on a plate.
You would be surprised about how many people prefer medium leveling servers, where they can actually try and work for their kit, or levels. If you don't do either of them, theres no point actually playing.
The vast amount of medium leveling servers have stayed up for ages, (Or longer than fast leveling servers!!), for example:
King Server
ValleysMir
LOCMS
And believe it or not, the reason why people who like slowish servers, like me, decide to play the fast leveling servers is because there are so many of them, and not as many slow servers, and the slow servers around are either euro mir exp or nothing is added to make it any good.