All speed servers are full, the faster they are the faster the reach the limit.
Why doesn't Travian directors start faster servers instead of just 3x?
They would have more players and they would make more money because people would be more active, aggressive and of course they would want all the advantages that Gold gives them.
I am currently playing on 7 speed servers at the same time and I love it.
I would love more if they were 30x instead of just x3.