All that being said, still though...137 BTC is nearly $70,000 lost :-P Even if that was over 10 minutes or 10 months it'd still suck so bad, but I guess the size of the loss is directly proportional to the size of the bankroll

I don't think you understand how this works. He has not lost 137
BTC, or deposited that much; that just means that he has wagered that amount. Even if you start with 1
BTC, you could easily end up wagering multiple amounts of BTC with that single deposit. Does that make sense? You use the same btc you started with, but every time you bet, win or lose, gets added to the amount wagered.
Net profit is how much he's earned or lost. He has, in fact, lost 137+ BTC. His wagered is actually 6,263+.