i play euro times. 60-80 people in the arena is a norm, 100 is high levels.
Even at 80 it is a challenge to find a fight.
As far as I can tell, maps are simply too large. Back in WB days i remember 80 players as excellent number on given map, but they weren't THAT big.
Notice that largest distance between airfields on N-S W-E axis is 120 miles.
Ok, not much room for strat, but you can find a fight really easily.
I wrote to HT while back with an idea of "sizing" maps using cloud fronts - basically - depending on arena numbers clouds from the external edge of the map would close in or move out to make to narrow or widen playing field. Obviously map would need to be designed to accommodate for that. This way you could size the map without kicking everyone off the server.
Game is fine. Just need to make it easier to meet
Too much room.