The KOS stuff may just be for fun. I doubt he needs the dough. My wife was the KOS in Vegas last year and she said it was the funnest show of all that she saw last year (we saw Bon Jovi 6 times last year) and that JBJ seemed so loose and to be having a blast. KOS gigs are probably a way for JBJ to let loose and play a bunch of covers and different versions of songs with different musicians etc...