Rath is quite loaded from the classes he teaches as well as the prize money from all the fighting tournaments he's won.

Toshu is pretty loaded, too, making sizable profits from his business, in addition to receiving the occasional donation from his brother (whose mercenary work pays him handsomely).

Riddick isn't exactly rich, but he does earn enough of a commission with security work that he can spare enough to pay gym membership fees for a certain scrawny lion.

The rest are not particularly wealthy, but also not impoverished, either. They can definitely live comfortably.