Some people thinking that they should be buying a whole coin on which this is mostly impossible for most people because its already that expensive, excluding into those whales and rich people who do have that buying power but for us plebs then we would definitely having those impressions that we are already that left behind or having those thinking that we are already too late on which this is very wrong. This is why its really that recommended that if you are eager or that inspired to accumulate Bitcoin or other crypto then you should be that starting to accumulate even on small amounts on which just like on what you have said that if these amounts will be accumulate then it will become that significant somehow.
It is possible that OP intends to resell it at a higher price, whereas when the price of Bitcoin increases by $1000, it means only under 2% increase, whereas if he buys ETH, the increase of $1000 will increase the value of his assets by 60% at the current price...
I think OP also understands the basic concept of Bitcoin where we can buy it in small amounts, like 0.001 or even smaller... according to our needs and budget...
So maybe what is meant by expensive is not the price to buy, but the price when you want to sell it is too difficult to get a high gain.