Back in the good old days when you could specify any bonus level, I set up so that I would sell my whole 1BTC level at 0.05 discount, i.e. I would get 0.95 BTC. Totally legal but unfortunately Mr MakeBTC noticed and changed the rules so that the minimum discount is 50%.

I could sell my whole level at 50% and clear a net profit on the venture, but I will stay in for a few more rounds until I do that. Gotta admit, MakeBTC is quite fun.