By well know people you mean people who are involved in technology, in that case then i know Bill gates has actually shown are real intrsset in Bitcoin when he was asked what he thinks about it and also Mark Zuckerberg the founder of Facebook is definitely involved in it since he is trying to creazt his own cryptocurrency for people to use on Facebook, and also Tai Lopez who is a rich and a successful investor has also started investing in many small altcoins. and said that they are defiantly a source of profit