the FBI figure of 1.2 Billion is going to be massively massively off. It's just the total number of btc ever spent multiplied by the current exchange rate. SR has been around since 2011. up until jan or feb btc had been in the doldrums having previously peaked at about 25-30 dollars. i remember it sat around for about a year and a half maybe, very slowly rising from 1-2 dollars up to 10. so this figure is counting for example a purchase for 100E made when the btc was, lets say 2 euro, as being 5000E towards this figure of 1.2 billion.
This paper http://arxiv.org/pdf/1207.7139.pdf calculated that in the 6 months before july 2012 the total revenue made by the sellers on the SR was 1.2 million a month, amounting to 92,000 a month for DPR. I know the site will have grown since then, but not by so much as to bring the monthly figure up to the 10s or 20s of millions needed to make the FBI figure even remotely accurate. This was much smaller fry i think than many people realise
This paper http://arxiv.org/pdf/1207.7139.pdf calculated that in the 6 months before july 2012 the total revenue made by the sellers on the SR was 1.2 million a month, amounting to 92,000 a month for DPR. I know the site will have grown since then, but not by so much as to bring the monthly figure up to the 10s or 20s of millions needed to make the FBI figure even remotely accurate. This was much smaller fry i think than many people realise
