> if you don't need that money why are you betting it to get even more money you don't need? :)
Why do rich people go to the casino? Why do rich people invest in risky projects? There is a thrill to gambling itself. There is a thrill to winning as well. Yes, even winning things you don't need. I think this is asymmetrical: When gambling with money you don't need otherwise, the joy derived from winning is greater than the loss of joy derived from losing. Especially if you win really really big :-)
There's another point, though. If Tezos really takes off, that could allow me to do things I can't currently do. The more it takes off, the more interesting projects would open up. So you could say that, in a sense, and until some point of saturation, I would start "needing" the money more and more as more and more of it accumulates.
If that seems like a paradox to you, that's fine with me.