I am trying to collect as much data as possible to get a rough idea how much money is being spent in bitcoins market place. I am intersted in doing this as a result of many claims that Silk Road is the "driving marketplace of bitcoin" - which I don't think is particularly true. If you have any links, or information about the below companies please share, I will keep it updated as more information comes in. If you have any other suggestions on other bitcoin related merchants let me know.
BitPay ~
$5 million/month
CoinBase ~
15 million/month *February buy and sales total | *
emailBitcoinStore Lifetime sales: $662,993 | $662,993/7(?) months = $94,713/month
BitMit ?
CoinGig ~
$5,000/month
Avalon 8 million in chip orders? *from comments here on bitcointalk, looking for links
Butterfly Labs ?
KnC owner refuses to answerAsicMiner ~$6,711,800 (unknown time frame) | Blade Sales Income: 29,594.75BTC + USB Sales Income: 37,524.00BTC
Satoshi Dice ?
BTCQuick ~
$320,721.23/month
The only data I can find on Silk Roads annual sales is roughly
$22 Million a year, i.e. ~$1.8 million/month so BitPay alone technically processes more than Silk Road alone.