You could easily accept it as a payment option without advertising.
Oh, for sure! But since ModRetro was never about the money for me, I would like to put as much of it towards Bitcoin as I can. We have a very active buying/selling community, and I think that if I made a good show of supporting it, a lot of forum members might convert over to BTC for their inter-member payments.
@Freemoney: I mentioned it at the bottom of my first post, I have seen them. Trying them out right now, just waiting to get approved, but I would prefer a stable relationship.