I limit myself to, at most, swapping out fingerboards, and I do that very selectively. What I was referring to in my post was the "small stuff": sanding down what would be called "ski jumps" on an electric bass or filling in "low spots" on a DB fingerboard, which I also have done successfully. But I know my limits; there is no way I would try to plane an entire DB fingerboard.
The question is not about cheapness or affordability; it's about access. The closest double bass luthiers to me I have found are either in Nashville or up into the Carolinas. There are none in Alabama or Northwest Georgia that I have been able to find. Violin through cello, yes, but nothing for double bass. You live in NYC and therefore do not have this impediment to deal with.