Let's make the game playable first, let's get the early alpha version underway and let's discuss any issues and problems before we release the game to public. That way the devs can silently release it and form a community and get a firm game as a canvas to develop from, then we can think about advertising.
PS: Growtopia payed a maximum sum of $0.00 on advertising. If they can do it, why not us?
(Bear in mind Seth has been developing games since he was like 16. He's well known on indie game communities.) Maybe we'll tackle the issue once we get to it.
I'm loving the way this game is developing, Unity has proven to be a massively successful platform for online games, it's the future brothers! (Even Seth from Rtsoft wishes to make a game using it).