People are being over-dramatic about this whole thing. Nobody is forcing you to put your mods on SW so why worry? Nobody has ever complained before that they weren't making money off their hard labored mods...it was for the sheer enjoyment of sharing. So what has changed in you mod author's just because Steam made a new idea even though we're on the nexus. Nobody even really used SW in the first place. And if you mod authors are looking for money....wouldn't it make more sense to get a real developer job instead of this...? Logic people. Use it.
A donation system would be great. People who make mods worthy of pay would actually gain money. Mod authors....don't put your mods on SW. You wouldn't benefit in remotely any way. If your mods become successful and sell, 75% of all profit goes to valve. What's the point in that? Valve makes money off your hard worked mods? That's completely stupid.
If you're against this, sign this petition to stop it. Instead of complaining about this action, actually do something useful and kill their idea - https://www.change.org/p/valve-remove-the-paid-content-of-the-steam-workshop