It is just greed.
Crypto currencies are unregulated and disconnected from economic fundamentals. Their main benefit is a way to store (often illicit or illegal) financial wealth beyond the reach of the authorities.
Their value is a function of supply and demand - a gamble.
That they can be sold for "real" £,$,Yen etc and can buy cars, houses, yachts, drugs etc etc is possible only because the market believes they have value. This is true of all currencies, although at least the conventional have some foundations in long term realities of trade.
With horses and cards bets are based on fundamental form or probability - although the only long term winners are the bookmakers. Bitcoin etc is the product of some clever programming expressed in some digital blips. The long term winners will be the "Bitcoin Bookmakers" - the developers and techies.
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