Good observation you have there mate. For all we know we have been buying and buying when the coin or token is at its lowest - at a certain point in time. What I mean is if the coin is low that day then we buy more coins. If you are not satisfied with the performance of the coin then you wait until you get the selling price you want and as you say it becomes an investment. But what I like to know with our fellows here what would be the best day strategy that you can implement to ensure that you can get more profit on that day?
I did remember when Bitcoin as well as altcoins in a great volatile market. Usually, day traders are split between group of try to maximize their gains by doing lot of trade in that day while other groups chose smart way and maximize their gain by only trade something they're sure to bring back profit. Low risk, low but safe reward vs High risk, high reward but uncertain. I think USDT-BTC pair trading is a low risk for day traders.