From my records about 70% of 1/2 hands are raked so this is definitely an overestimation, and this is full not short handed. The clearing rate for me at 1/2 was closer to $3-4/hr per table. Nearly all of the hands at 2/4 are raked, and the competition isn't much better. You will run into a lot of people who buy in really short as well. I do recommend signing up for rakeback or at least through a comp site such as ecasinodeals. If interested in rakeback check out
www.rakerebatereview.com which has listings of the different affiliates and the sites they offer.