Huh? Did I miss something? The max profit is 176.82 BTC, so you should be able to bet nearly 90 BTC on 50% chance.
I don't know where you found those numbers, but if you look at the 50% chance address, you'll see that the max bet is somewhere around 18-19 BTC (now).
I posted that question because I was getting somehow worried, as the max bet kept getting lower and lower. Now it is the other way around, it is increasing every day.