It's beautiful to dream of more Firefly, but PLEASE DON'T SEND ANY MONEY. Just keep being great Browncoats, which you are!
He also says: I'm proud my coat is brown.
So there you have it from Captain Tightpants himself. Keep your money in your pocket. Or, if you're determined to contribute to the Help Nathan Buy Firefly campaign, they are now looking at various charities to give the money to. Now that's a good idea.