Well, i've been tracking my band with bass guitar, drums, and vox through the PA. I've managed to move around some bass notes from the DI, and the bleed is no noticable. I've managed to move a couple of kick drums on the individual mic, and the spillage just sounds like a flam or something insignificant, and only if you're really hearing.
Anyway, if you're recording band practices then tightening everything up with a fine toothcomb isn't really the point is it? I suppose it's about your approach to the recordings.