Well, you can buy Bitcoin at a high price, but it can go even higher later on. At the same time, you can buy altcoin at a lower price, but it will eventually go even lower.
What's more, it can be vice versa

You decide
eventually if bitcoin keeps rise up alts will fall and we already see that from previous movement of bitcoin the more the value go forward alts falling down and if we go and buy alts better to look and find those good alts with more progress ahead so if the value went up even the rise of bitcoin we will be able to profits.