You answered you own question and I can't agree more with that opinion. Doing crypto takes patience and reasonable mind, but not huge capitals and selling everything to just get into it.
This is not normally the case. You can enter with any amount in the crypto market but of course you cannot deny the reality of gaining big by investing BIG.
We have examples of people like the famous Tim Draper and the other Bitcoin billionaires who had nothing but a multi million dollar investment made in Bitcoin in the early days of the decade and this paid off in the recent boom. This is the reason why people prefer big investment for big profits and this is quite logical.
If you have investment, it is good for earning more in less time, but if you no money; you can still make money in cryptocurrency. It is not necessary to invest big money for making big profits. You can start form small investment and if you realize that it is good and you can earn money from this market, then you can invest more money if you have.