I played ONLY SnGs everyday for about 3 months at one point, and although I no longer have my data, I remember that I was doing about 44% ITM, with more 1st and 3rd place finishes than 2nd. This probably comes from the fact that a lot of the times I folded my way into the money and got 3rd, or else got headsup and played a clueless guy. Regardless, I think you should be aiming for 45% ITM, and 1st more than 15% of the time, as this will ensure a nice profit. My problem was that I was getting 4th too ofen (around 13% I believe), so try to avoid going out on the bubble. Generally $50 SnGs will have a mix of good and bad players, where the overall competition will be fairly solid (but beatable). I would either do 2 or 3 at a time and see how you fare. Until you get down to 5-6 you really can just fold everything but premium hands since the starting stacks are bigger.