All of the above about selling Busses is just rationalization. The real reason, which some are too shamed to admit, is that occasionally someone for some reason is forced into detox, by a wife, girlfriend, or just waking up with an INFI hangover and too many unpaid bills, and swearing never again.
They take the vow, get to step two or three, and some might even make step 8 or 9, disposing of many good knives in the process, but invariably they fall off the wagon, slipping back into that sinkhole of "just one more". So the whole sorry cycle starts over again, further feeding the Busse resale monster.
Then of course there is Skunk, who is forced periodically by the U.S, Geological Survey to dispose of a certain amount of accumulated INFI to avoid revision of the magnetic declination charts for North America. I believe that this was required by House Bill 1051 as modified in joint committee, passed in the first Clinton administration.