I think the standard thing is to charge more if the customer pays via Bitcoin, and to expect payment in 3/6/12 month lumps rather than a month at a time. This

I think the standard thing is to charge more if the customer pays via Bitcoin, and to expect payment in 3/6/12 month lumps rather than a month at a time. This could help to deal with increased customer service costs (abuse handling), and to price spammers out of the market.