That seems unlikely. Bustabit's house edge is 1%. You won't find many land based casinos offering games with an edge that low. Slots for instance typically have between 4% and 6% house edge.
You're ignoring an important fact: 99% of the bets a casino takes are tiny, and don't really contribute to the bottom line. A very small percentage of the bets are huge, and it is those that determine whether the house ends the year in profit or not. Look at the huge day that Bustabit had a few days ago. That whale could have easily ended up moving the site's profit up or down by 1000 BTC in a day. That's likely more significant than the rest of the year's play combined.
Bustabit is somewhat risky. They are risking up to 1.5 times the recommended maximum according to standard bankroll management theory. That increases the risk of ruin a the hands of a lucky whale. That's not to say that the investment can't "work" - just that you could end up with a big loss which never recovers. If you lose 90% of your investment when someone goes on a lucky run, then other investors come in to refill the bankroll, your share of the bankroll is a tenth of how it started and even if the whale loses his profits back to the house, you mostly don't recover your losses due to the effect of dilution. It's even possible the winning whale himself invests his winnings, diluting your bankroll share.
Maybe return them; they're broken. Mine have increased over 1000% in the last year: