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Variance can suck out any profit from cash games and can get you deeply stuck for months on end (see: any full time poker youtuber). Tournaments are even higher variance.

And if you switch to doing this full time, you become self-employed, which drastically increases the cost of taxes, healthcare, social security, etc. Medicare tax doubles. Social Security tax doubles. You must buy your own healthcare, which drastically increases in premiums (unless you have a spouse who can add you as a dependent on their W-2 sponsored plan).

This really goes for any self-prop business/freelancing. In exchange for freedom of being your own boss, you pay in stress, variance, and taxes.

To make this work, you'd probably have to make double that per 8 hour session. Which is insanely difficult to do as a poker pro and sustain as a "full time job".