But if I use 0.8% gain, because of the fee, there is a real gain of 0.3% of the trade volume. If I successfully trade 10 times, my gain is 3%. That meens of I trade 33 times I have a gain of 10%. Then the market crashes... I sell -10%... so I am at 0.

How often do you trade successfully 33 times before the market goes down 10% Which market is that stable?

Or is my taktic wrong??

Is there a help to max. my gains with cat or what criteria must be at a market to go in with cat?