Don't forget the extra character slots, which I'm getting right now.
Yup, those too. Well anyway, I emailed the devs, and I talked to them briefly in game about accepting bitcoins, I don't know quite how they took it. I gave them a few links to check so they can better understand it, so hopefully that works.
If they don't start accepting gold, I will probably start buying Ultimate Game Cards (game gift cards that can be used to buy gold) from people with in game items, and then I'll sell those for BTC.