That's exactly what happened at Just-Dice.  nakowa hit us hard in the middle of July and again at the end of September, as you can see in this chart:



We were fortunate enough to recover from nakowa's beating within about a month, due to a few other large players suffering massive losses, but we lost a lot of investors due to nakowa.  He replaced them for a while, investing his winnings in the bankroll, so he ended up winning twice: once from betting, and once from investing his winnings, profiting both from the collapse of JD's profit and from the subsequent recovery.

Note also that we're still over 35,000 BTC below expected profit, and expect to stay there indefinitely.  I calculated recently that if we get average luck from now on, and continue with the same level of betting we've seen so far, it will take about 100 years for the site profit to reach 0.99%.  And your 1dice player was much luckier than nakowa I think.