If you broadcast the achievements ( it will ask you to "brag to your friends" ) then you will earn lots of gold for this game.
Playing BYM alone I'm level 20 on that game and have earned 40k so far just from sending the achievements in. Your friends dont really mind it if you click "brag to your friends" because they hardly see it. This game was designed for facebook where it would post a message on your wall, but since this is gaia it only appears in a small corner of your My Gaia page.
The same goes for Resort World, you will earn gaia gold for sending achievements on that game too.
My main account which is level 30 on BYM has earned maybe 120k total from only BYM, and a few more from Resort World.