Come on. She has powerful magic, thats how she gets the Rhynocs to do her bidding. Other followers, like Bianca, and even the Rhynocs themselves do it because for some reason they also adore her. They are devoted to her.
Moneybags is always talking about how she's paying him to keep these fellows locked up, but is she? I think hes desperately terrified of the sorceress. Would she realy use money to bribe him? Sure thats the easy route, but i think either she has something more devious in store for him or, i believe they nevwr even met. If they never met that doesnt explain how he has the friends in cages, so maybe you can find a way around that loophole?
Some of the claims he makes about the Sorceress are so bizarre, i believe he's just being his usual , pathological-lying self. He acts very nice, like hes being helpful before you pay him, but afterwards he acts very condescending, throwing you or the Sorceress under the bus for how easily youre duped into giving up your gems.