As @bass12 said, define "famous" as a bass player...
I take lessons on and off with Dave LaRue. Great player, and as a teacher he is phenomenal. In lessons it's all about how to improve my playing, and he really understands the learning process. My lessons aren't priced much higher if at all than I'd pay anywhere- totally reasonable.
Despite their renown in our sphere of knowledge, many respected/famous bassists aren't "A-list Famous" or even close. They're down to earth, and happy to have the side hustle income.
Even it costs a bit more, learning from one of the best is worth a lot if you get someone who can really pass on their knowledge in a way that helps you. Most of your playing is outside of the lesson. The actual lesson time is so minimal relative to practicing, that the lessons should be really high quality, helpful, and valuable. I'll pay a bit extra and (in my case anyway), to know I'm getting the best instruction.
So in my case, great teacher and famous player (at least in bass circles), but agree to go with the best TEACHER you can find. I take lessons from Dave because he's a great teacher- the fame didn't factor into it at all. If you luck out and get a well-known professional bassist who is also a gifted teacher- all the better.