Very interesting. I think it's awesome that both you and Beer planned / plan on making Sheep Tag.
I reckon you should do cool stuff where players feel awesome as well as it not changing the game. Example: they pay X amount and for X games there name will be displayed as Sheep / Wolf, etc.
I think advertisement in chat would be nice - the better the chat would mean more people would chat within the channels, meaning more add viewing.
As for servers those seem really cheap. You should always keep donations an open option. Would it be possible (within) chat means to have some like, two advertisements at once, would
that increase revenue, no?
If the game really is near alpha I think that's awesome and would love to see the fruits of your labor myself.
I'm not gonna lie, if I were rich I would sponsor anyone who makes Sheep Tag with mass money rofl