[curtains]

I believe pushing is correct and that most of the time it will be slightly +EV. If I know the BB very well or play with them a lot and they understand that I will push too much, I may fold instead, because now they will call me with crap like K4o without much thought, thus making my push clearly -ev. In any case even if it was neutral EV, Im going to be paying a blind in a few hands and that will be clearly -EV as well, so generally I don't think you need a very large advantage to make such moves.