> All of the vitamix machines I've seen let pulverized food collect in the threads and quickly begin to smell terrible, because the rubber seal is at the base of the male side rather than the base of the female side.

I've had a single Vitamix for...huh, well over a decade, at any rate, and I've never had this problem with pretty consistent heavy use the whole time we've owned it. Pretty consistently cleaned according to directions, which are as described upthread.