@akg_ca you underestimate the talent of many home enthusiasts. While I am not a painter, there are many areas where I do the work myself because my work is better than the pros.
I don't know about @jeff7630 but I wouldn't assume he is talentless.
Second, used speakers sell at half of new anyway. if the paint isn't perfect, you still can get 7/16 of new. Don't pay 40% of new for a pro paint job.
And changing from an unusual color to black, probably improves resale.
Jerry