Back then, MS didn't have an easy way to track transfers and transferred points just assumed the home resort and use year of the contract into which they were transferred. Some Members were transferring large amounts of SSR or OKW points into BWV/BCV/VWL contracts and using those transferred points to book BWV/BCV/VWL during the home resort priority period and then renting those reservations. Many of those reservations were perceived to be "spec" reservations for popular weeks. Eventually
DVC decided to act and that's when the transfer rule changed back to one per membership per use year, either into or out of the account, but not both in the same use year. (Believe that was the original rule which was later changed to unlimited and now is back to one).
Also around the time the transfer rule got changed, several members got letters re the "commercial renting" clause in our contracts and were told that more than 20 reservations would result in an audit to determine if they were in violation of the commercial renting clause. I don't know if any accounts were "frozen" as a result of those letters/audits, but if memory serves, several members stopped renting and sold off contracts shortly after those letters went out.
A lot of the "negativity" from some DISr's against renting stems from that period. I, for one, was quite disappointed that DVC allowed "point morphing" to go on so long before they moved to stop it.
Just a bit of history as I remember it.