Well your opinion is plausible but I beg to differ with you a little. Without patience, one can only make some few dollars from this market. Take for instance, if one had invested in a project like Ethereum and sold when it hit +20% profit and later realised it actually went up to +130,000% in profit, what will be his stand? The golden rule I use are:
1. Never buy a coin without a product
2. Never join pump and dump so as not to get burnt
3. Never jump into the market when there is a sudden spike in price
4. Never buy a coin you don't believe in.
With these rule, I buy and hold certain percentage for a long time and sell some for the short term and it has been working just fine.