1) I'd pass. 180 donuts is a lot for a freemium character. By freemium, meaning he earns the same money/xp as like normal level characters.
2) It's pretty likely he will be offered again, which will be closer to half the price, or same price but with a building.
3) When he is offered again, he will earn premium rates, justifying the purchase.
Most event characters return. Shauna, Brandine, Sherry Bobbins, Hugs Bunny, Kang, Kodos, etc all have returned at some point. So it may be a future event, could be issued as a level character (highly unlikely - only happened with Fat Tony), but the safe bet is that he will return. Only Kumiko and maybe a few others are on the super limited release where only certain people have them.