1. I calculated these kinds of odds a few years ago. My spreadsheet says 32% is the raw probability for this. In reality it's less, because (a) they probably won't keep every badugi they make, e.g. if they hit KQ2A on the first draw, and (b) they might well give up before the river. So yes, it can be profitable to snow. As you move up the stakes you'll be suspected of snowing more often though, and it's actually quite easy to make say 52A on a two-card draw, which they might try to snow-catch with.
2. Do you mean the highest? Back in 2010, when I played a bit, the smallest game on Stars (25c/50c) was absolutely crushable, and the next two levels were extremely beatable too. There was a definite step up at 2/4. Now I don't know.
3. Watch this and enjoy:
http://www.cardrunners.com/poker-vid...st-3-przytula/ Some sound strategy there. People did treat badugi as a comedy game and that's partly why it was so profitable.
4. I really don't know, sorry.