First: but what if you and others were also devs. 'Dev' for devcoin isn't just software/hardware. It's writing, art, marketing, other ideas.
I am a dev, and of course I'd love to receive 90% of the profits the miners do. I'm just having a hard time trying to picture a miner saying "Oh, hey, let's mine this coin which is 90% less profitable than any other cryptocoin that I could mine with this hardware, just for the heck of supporting developers, art and culture".
The idea in itself is not bad; I'm not against supporting creators. The problem I see is that it can't hardly grow if people are greedy, which they are.