What's your humidity in the house like? I'm in an arid climate, and have never had to put a hole in an AP rack tub. The gap at the top lets it out just about as fast as I mist things down. The RB racks on the other hand, where tubs fit much tighter, have needed some holes. A humidifier in my snake room has alleviated much of my low humidity issues.
FWIW, my CB70's don't hold humidity worth a squat. So if the general consensus from the "experts" is that this ain't true, I'm a big ol' liar.
