Read this post and its true how small investor are losing bitcoin by investing in other coins.
You can buy 8000 tokens in 1 USD when price of bitcoin is 8000 USD but if bitcoin price will rise to 16000 USD then you can buy 16000 tokens in same price. Now all token price does not move according to BTC price,it will drop 20-30% without any sign of drop, but when you will compare with bitcoin you will find that you are in loss.
https://cryptomaa.com/btc/how-small-investors-are-losing-bitcoin-by-investing-in-altcoins/This is not how it works. If bitcoin rises to 16000$ then the altcoin may even fall more and you can buy much more than double of that altcoin. When you buy an altcoin with bitcoin, you should note its satoshi value. The aim should be to sell that altcoins at a higher satoshi value.