And when the information becomes known to many people, the profit ends immediately.
If you want to mine now, I would recommend learning asics. Even for home and flat for altcoins there are very quiet options, but it does not guarantee profit.
Ethereum classic could have taken over easily but ETC algorithm supports Asic miners which makes it less profitable for GPU miners and better for those who can buy expensive Asic miners, it is such a shame.
If you are not finding those GPUs for discount price right now it is a waste of money, the cheaper you got them the better, I've walked on this path for few years to understand some things, GPU mining seem profitable in a bull market and that is it, once bull market is over you are left with nothing until the next bull market again.