Third question was easy to understand. Why should devs do things which won't be needed when Toribash gets Greenlit? To remove them and use Source SDK instead? That's cool.

"I would love to donate but blablabla"
Things don't work like that. You donate first, things get done next. To get something done you have to pay devs. They don't work for free, you know. And to have something to pay them users should donate.