Quote from TrendSailor:
p.s. I find your question intriguing. What is the "optimal bet size" according to probability theory or Monte Carlo? I think it must scale to investing at large and should be a general rule that can be applied for an arbitrary basket of risks (even if we do not know the real risk and probabilities or the shapes are not binomial/normal.
Kelly's formula is good starting point, though I don't use it myself.
The problem is a balance of reward against risk for a trader.
For me with limited capital, I want to make as high %age as possible. However, to stay in the game, I have to control my risk.
I started trading ICs and DDs since July. I started small, and I increased the size slowly but not too slow that the return was meaningless to me.
Too better understand the statistics of my IC and DD trades (Your probability of winning is different from that of Coach's because of different entries, exits and selection of strikes), I set up a new account this month only for these two strategies and to gather statistical data.
The market is always here. There is no rush to make big, at least not this month especially you are controlled by your emotion now. You can make back your loss easily (Your net loss is only 25K, right?) Look at Coach, Sailing, Cache and others, to make back 25K is very easy esp if you have enough capital and a winning strategy. I would suggest you sharpen your weapons before betting big.
[edit] One more thing about IC here. As pointed out by many including RA, Mo, a credit spread strategy with 1:10 reward risk ratio(90% winning prob) is not recommended nor promoted. However, by cutting loss fast or some other adjustment strategies, you can increase your reward risk ratio. I don't recommend trading ICs without exit strategies.

