Why people do still buy stocks? It would be on these common reasons
1.Security
2.Cant risk out with too much volatility
Why people get even rich with stocks? This would always vary with the amount of capital you have put on and even there's some 3% change in price then profits would be significant.
So its just normal that they would able to make some money and also you cant say that those stocks-loving investors doesnt get involved with crypto.
And besides, not all these stock traders are familiar or into crypto. So you can't expect all of them to go into crypto market. The risk in crypto is quite high as compared to stock market. Those people in stock market, already know the ins and outs in their system. But with crypto, they need to be oriented also and learn how crypto trading works. And the bottleneck may be on how to be familiarized with so many alts. Each alt has their own pros and cons.