Holding cryptocurrency is easy and it not about been rich, it about human understanding and discipline between financial needs and saving. However, having the thought that you kept some coins somewhere is the reason why you later sell it but if you stake such coin for years if you can hold it by yourself that will solve the problem.
Well, I don't think a moderately earning person can afford to hold some 10 Bitcoins which he purchased at let's say $1k and if the price reaches 10k, I don't think he can hold for too long, and watching it reach $50k after selling is going to make his decision look bad but in reality, it isn't.For that reason which is true for most people here, I guess I need to agree with OP completely. In some sense holding is only suitable for very rich people and this may be the one of the reason why people always says rich are getting easy chance to become more richer 
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I agree the rich have easy chance to become richer but same has regular people who always think outside the box and welcome new innovation technology..