They are looking at the return and Bitcoin provides it. I dont think the industry the billionaires come from matter. They all see the potential when they are getting involved.
If Bitcoin keeps producing nice gains, it will keep attracting more people of this ilk.
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I also think the same as you, millionaires are seeing investment is because what returns is quite a lot of money when they manage to sell bitcoin.
Greetings and thanks for your input.