He can't read, which just makes him a parrot for others who research into such matters for him, Above all those who are swept up in the image of the man will allocate their funds where he does creating a hype surrounding said investment. People should still be doing their research on any ICO they plan to put money in. And by research I do not just mean read the whitepaper but actually look at source code and commits, checkout the profiles of the figureheads and leaders, do market analysis, see possibility of current and future competitors, and get community feedback. Time will only tell whether this is good idea on part of your average investor but for Mayweather, well he has millions to burn so I don't think he cares very much.