Out of curiosity, did you see any uptake on that option? A lot of places seem to be adding the BTC option lately, but I haven't managed to find any good sources on how much use there is once the option is provided.
It's interesting that the accounting costs more than they bring in (though this is something that could obviously change with increased stability in the BTC/USD rate / increased volume / better processes). Somewhat concerning, considering that they host what seems to be one of the most active/vocal bitcoin communities out there.
1. The site audience tends to be a little older and not very tech-savvy, so Bitcoin isn't something that many are interested in comprehending.
2. Since the price was fixed at 2BTC a few weeks ago when 1BTC~=35USD, and now 1BTC~=100USD, people will see this is a raw deal. (The USD price for a membership is $65.)
It's #2 that's the hard part. I'm not interested in accepting BTC just so I can convert it to USD, but since everyone's so focused on the BTC->USD exchange rate as the measure of value for BTC, and since the rate is so insanely volatile, it's impossible for a merchant to fix a "fair" price without auto-adjusting the BTC price to the USD exchange rate.