From August 2011 - August 2013 BitInstant processed around 400M worth of BTC to customers. (rough estimate)
Thats about 24 months in business.
In their indictment, the government alleges that 1M of that went to Silk Road. (I wasn't even selling BTC to Silk Road users, I was allegedly selling to a guy who in turn resold the coins to users on Silk Road for a markup )
That means over a 2 year span, 0.025% of transactions on BitInstant were for Silk Road.
BitInstant's total operating profit (before costs, expesnes, ect) on 1M USD is 1.5% = $15,000 total the company profited from these alleged crimes, over an 11 months period. Thats $1,363 per month.
Charlie was doing pretty much exactly this (granted he was making more money from it) but the only other real difference is that he was profiting from and helping SR.
I personally made no extra money from these alleged crimes.
Well very little extra money, but this isn't the point. The point was the volume, however it looks like the volume really didn't make a difference on your bottom line.
EDIT: I do remember doing rough math when the indictment came out and calculated that the amount of money you made from allegedly selling to SR was ~$10k.....I hardly think a 30 year sentence is appropriate with this level of profits.