Butch is, after all, just another flavor of womanhood.
I can come up with plenty of great reasons for liking butch, masculine women. Oh yes, we were talking about the attractiveness of butch women. You also mentioned women who act like men, which aren't necessarily the same women as the butch ones. It's a commonly held myth that butch women all act like men, all the time. Only you really know why you find butch women attractive, but whatever the reason, more power to you.