Daniel Murphy found "The Five Most Insane 1-900 Numbers from the '80s and '90s" (one seen above). A reader writes:

The other major part of PrimeTel's business is the brokering of all those 800 numbers.  While they surely benefit when consumers misdial and are lured into a phone sex business, even more attractive may be what happens when a major company realizes that a significant percentage of their callers are misdialing.  Such a company would be willing to pay PrimeTel tens of thousands of dollars (sometimes hundreds of thousands) for the privilege of transferring ownership of that 800 number.  I know this from personal experience because I have bought numerous toll free numbers from PrimeTel on behalf of my company.

Another writes: