Bass solos? Never ever, blo*dy ever.
When playing live (in a covers band) before going in to a specific song with an excellent bass intro (which are allowed of course).. I will inform the punters what a bass is and if they are ever at a gig and the bass player threatens to play a solo, they should finish their drinks, grab their coats and leave in composed yet hasty fashion. I then tell them this is an intro... and off we go