Correct.
What most people forget is that you only made money after you sold everything and the cash (not in crypto's but in hard $) is in the bank. There are at this moment around crypto's, valued at 350billion $ floating around. They have no value until they are converted into a classic currency.
To me, floating profit is real profit, just like floating profit in any other trade.
However the cryptos are different from stocks/commodities in that all the markets are highly cornered... the biggest BTC has 4% of wallets owning more than 95% of the coins.... the alt-coins probably have even higher concentration.... which is why these things all move together, up/down by 10+% 24 hours... only possible when these moves are just large wallets trading with each other... true public supply/demand can never do this - in stock/commodity market, 1,2,3% moves are considered big things.
So in that sense you are right - the market cap is very misleading.... if only 10% of btc are in mom&pop's hands, and at the peak the cap was about $300b, this means the ponzi has scammed about $30b from the public.
, Bitcoin will see new highs above the $20,000 Dec high.