Because as far as I've understood is in Cryptocurrencies the early adopters have a serious advantage? Even with new coins it is hard for newcomers to get into. I try to mine a new coin but as soon it gets listed on some efficiency chart difficulties get so high I have no chance.
that is one way to look at it.
another way to look at it is early adopters endure far higher risks than late miners. when the coin starts, it's not on exchanges, there is no community, no infrastructure, no public awareness, and the coin has no value itself. the early adopter must sort through all the scam coins to find a coin they can actually mine. most launches don't have all cylinders firing: lack of wallets, lack of pools, unethical developers , and the risk of fork is high.
as a late miner, you do not shoulder any of the potential risk the early adopter did. the early adopter made a conscious effort to risk their electricity, cpu cycles to mine a brand-new, untested, unvetted coin with no certain future. as a late miner, you're directly benefiting from the early adopters weeding out the crap coins. if you see value in a coin on an exchange, or in trade, then that's only because of the hard work of the early adopters.