It's because devs make no money from PoW mined coins! It's as simple as that.

Bitcoin succeeded because of the idea. Etheruem succeeded because it ran an ICO. I'm not sure why everyone hates on ICOs. Instead of buying a miner and mining PoW coins, go buy ICOs and/or buy PoS coins and stake them. Either way you are paying a lot of money to get into a coin. Instead of wasting money on PoW give the money to the dev and see what they can do. ICOs are the best.