DJ Khaled and Mayweather had an issue about shilling an ICO. And other celebrities hyping or promoting scam coins. Who would actually rely on their words? If you're listening to celebs then you are not ready for this type of market at all.
If you are very much into Cryptocurrency you will not look at those celebrities promoting cryptocurrency but rather you will look at the platform and their roadmap, you will not rely on other people to look on where and what you should invest in, it's a complete disaster if you do that.
Of course we will have to trust and value our own observation because even if celebrities are promoting something but it is not sure that if they use it personally or doing it only for money, but still many celebrities are using and investing in crypto currency which is good for both the coin and the celebrity, for me I think to some extent they can take part good part in development of crypto currency.