I've always been of the opinion that if you get paid for playing in front of an audience , you're a professional. Unless you're very,very fortunate indeed that will mean compromising your own musical tastes to some degree.
Playing any music will help you improve as a player - if it's music you don't usually go near then even more so.
The interest for most of us here is in bass playing , anything that furthers our skills doing that is , by definition , a good thing - Yes? No?
If you don't fancy the gig - fine. A mistake though , I feel , for any of us to sit too high on our horses. Lady in Red sold....how many copies?? Brought pleasure to how many people??
A far greater number than I can match in both cases.