From my experience I agree with all the others in that you should stay within your comfort limit. With continued success it will probably increase, anyway.
When I was young I won the price of a new car in six months of betting. Each bet was about half of what I was earning per week. When I got above my comfort level I became so careful that I would hardly place a bet. A valuable early lesson for me.

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Dear Lord
Please let me break even. I need the money.