ISF- yes, u can shortstack higher stakes than u would normally play

euph- shorstacking has very high variance relative to potsize, so if u think u can "make 1-2 bi a day" shorting then u dont have a solid understanding of poker variance. you may be able to run as high as 5 bb/100 (this is pretty generous) playing a fundamentally near-perfect shorstacking strategy over a decent sample. however, if u have the skills to do this u would 100% be better off full-stacking which leads to the point that shorties r usually mediocre poker players. what you have done most likely is run significantly above avg at the time u began to shorstack, and also play better as shortstacking is much easier. you talk like u found the "magic" way to make yourself a much more winning player, but in reality u r running well and will eventually have to combat the same issues to beat 100, 200nl as u did when fullstacking... there is also the inescapable fact that playing short yields a smaller bb/100 than a competent full stacker, AND garners the near universal hate of your peers who you r learning to play poker with...