But lets not fool ourselves either, there is also a lot of celebrity investments where a famous name is slapped on a lifestyle product like vitamin water, the celebrity makes millions, and the consumers ultimately get shafted because more often then not the celebrity name is just credentialism to up-sell a mediocre product. Shark tank does this as well because they know as soon as the show airs there will be a huge spike in sales by default.
Sometimes this is really bad for society as was the case with Theranos board of directors and any of the Kardashian brands. We shouldn't let celebrities amplify pump and dump schemes. I don't think the NBA players you listed have been involved, but I think its always important that we are vigilant for it...