As I am into ethereum mining, let me put my perspective this way: ETH mining will end one day, it will be proof of stake and we know that miners will move to something else, it could be ETC, it could be something else, but every miner will turn to something else, and maybe, and this is just a maybe, maybe someone will make a profit from starting now and when all other miners come into play and start mining that one, the price of that coin will go up?

In that case I believe someone who starts now and holds until that moments come, could make a lot of profit. If I mine x amount of coin and hold it, the worth will be 10x of it when all miners move here, that is probably the idea they have.