Here's some of the big hitters on Tsu. Some of these will not be generally known, but they have built big followings. This may partly be down to some help from the Tsu team, but also by encouraging fans on other sites to join up. Each of those recruits will be earning the star a little more through the Tsu algorithm that passes a share of earnings up the 'family tree'. I expect some of these people are making thousands of dollars per year from Tsu.
Even the fans can make something if they recruit their friends and do their own posts. Even if it's just a few cents they can make charity donations and I expect a market to grow that trades in Tsu funds.
You can find me at http://www.tsu.co/steevc. If you join up there then you become part of my network and can start building your own. There's currently a competition for musicians with prizes of $1000 and up. It's well worth an entry if you have an original song to submit.
Update (2021): Tsu is dead and so are some other platforms I used. I am now using Hive which has an active community and pays me. Let me know if you want to join up.