Steve has indeed put out a number of CDs singing solo, but live ones. There are several recent ones available from Steveforbert.com. 'Good Soul Food' is the most recent and most representative of what he is currently doing. It has Mark Stuart on it providing guitar backup though I don't think that adds much to it.
From recent interviews and his DVD, he says he would like to be huge but is happy with his lot. He wouldn't complain at being better known and sell more records either though. What is clear is that he has to work very hard to maintain and build his following - I doubt he really made a fortune though.