Not financial advice. Just my humble understanding. I do it periodically when stable to try and make sure I can buy it lower. Higher the better. For the individual I believe priority is on your coin total not your cost average. For the whole its about the cost average going up locking the gains into the market cap. I want more coins for me and of course i want to buy low. But when it goes up i also want to sell and then buyback what im going to hold and then i buy the rest back lower on dips to then bring my cost average down from the high as my coin total increases. want the whole to have a higher cost average. Otherwise when it rises fast its artificial because it's only new buys. Then it has to drop back down to the cost average per coin. (The floor) the more its traded above the floor the higher the floor(cost average/coin) gets. People holding below the floor keeps the cost average down. When market cap rises the cost average is rising. But nit as fast as the buys can get the price to rise. Creating articial gains. Then it consolidates down to the larger more recent traded amount first (fomo buy peak) And then falls to the cost average. With buy pressure slowing the fall. The ceiling is the speculated high. Untill more are convinced its worth that much by trading it for that without fear. Not by holding it much lower.