Are you serious? Literately all the time there is players in it, I was playing on and off from 4pm and every time there was 5 - 10 players in it all having a great time.
The 25 min cool down seems very very fair. I don't even think it would be that bad if it was increased, I think people who complain about this are those who go out on there first game every time, but if you are getting far each time and winning frequently them 25mins is nothing. You can also think of it this way, since 12k is a better prize than most GM tourneys a 25 min cool down is nothing.
However 10k QI rooms should not be added because I feel that most of the time people won't have 10k QI to play in the rooms, and those rooms will be a waste.
.. and/or at least make multiple 6000tc-12000tc rooms (with a 4th dan requirement) with the popular mods. (Abd, rkmma, ninjutsu, mushu, wushu, greykido).
Hnnnng