We should also not compare the value movement of altcoins to bitcoin because no matter which angle we look at, they still follow the value movement of the mother coin which is bitcoin. As you mentioned, some altcoins can be exceeded the price of BTC, so it's up to you where you want to invest. If you want to make a lot of money here in crypto, there are many different ways to make a profit here, it can be via signature campaign, investment and trading so it's up to you which one you are better at.
Your narrative is not clear, money flow between Bitcoin and altcoins and the time that happen is when we are in bullrun. For instance now, Bitcoin has had a lot of inflow of money coming from investors but now that halving is some weeks to go, people has started selling and moving their money from Bitcoin to altcoins, they are buying altcoins in anticipation for altcoins bull run after the bitcoin halving and when altcoins are done of their run, the money goes back to stablecoins.
Bitcoin profit might not be big but it's safer than altcoins but that doesn't mean it's not risky investment. All coins are risky but one Bitcoin is more like best of them, altcoins will give you all you ever dream of but a single news is enough to turn your investment to zero, Ongoing allegations of FTX is a clearly example of what I am trying to explain.