I get that and if that works for you there is no problem with that. Lots of folks work on cars for the love and passion of it too, but lots of people do it as a vocation. I would venture to guess that's why the OP included working bassists in the title. Many if us are playing professionally which just like a mechanic involves investing in specialized equipment, being available on the time table of your customers and employers, not your own, and working on projects you don't like and otherwise wouldn't do (ie playing sweet Caroline a million times, or brown eyed girl, etc). When you are working in such a capacity you want to be compensated fairly, just like a professional mechanic. I don't necessarily blame other players, I think it is the club and bar owners that I watch sell tens of thousands of dollars in over priced alcohol to hundreds of people in a single night then hem and haw about paying a band of great players who conducted themselves professionally, brought out $6000 + in audio equipment, and entertained the hell out of the venue's customers (keeping them there all night to comtunue to buy dtinks) $500. All the folks who under-sell their musical services do is enable thst sort of behavior.