semux.info's pool is available, but is very full.
semuxpool_com is available. It does pay out for votes, but is not validator yet.
I joined this pool two days ago. You're right, it's pretty full. My first payout was only 0.16 SEM (despite putting 1400 votes total across the five validators in the pool).
The pool cant get full, the more people that join and vote, the more blocks the pool gets to forge, the bigger the payout is for everybody.
The pool calculates payout on a weekly basis, and pays out on mondays I think.
Your payout was small, because you joined at the end of the period. Probably even joined at the end of the last day. And one of their top validators was offline for most of that day.
With 1400 sem, you should get around 4 sem a week. Depending on pool luck.
Triple that when the main-net is launched, if they increase the voting reward accordingly.