It took me a really long time to find information on Transferring points. There's lots of info out there about Renting, but very little about Transferring, even on these boards the info is quite limited.
Here's what I've found out:
1 - Transferring points for cash is against
DVC policy (so don't mention it to DVC)
2 - You can Transfer points into OR out of your account once per year (not both)
3 - It's a bit more secure because you are in control of the points instead of waiting until you arrive at the resort to find out whether or not you actually have a reservation (DVC will NOT talk to renters on the phone, only the Owner)
4 - There is still a risk so research whom you're dealing with (check Florida's Comptroller to make sure they actually own property; check whichever board you're on for previous posts <DisBoards seems to have very few people who Transfer points>; google them <you may be surprised to find out how much information you can find out about people on google>; ask for references and check them)
5 - There comes a point where it's a mutual trust issue and that's when you actually transfer the cash and points. One of you will have to "go first" or you can transfer 1/2 the cash prior to the transfer of points and the other 1/2 after. I highly suggest using PayPal for this service (though it will cost the "seller" about $100 so factor that into costs). The advantage of PayPal is that it's pretty much an instantaneous transfer of funds.
6 - Either you will both have to be on the phone with DVC to transfer the points, or the "seller" will have to have the account number of the "buyer". The latter can be a trust issue. I recommend that the "seller" call DVC then have DVC call the "buyer" (the seller will require the name and phone number DVC has on file for the account). (that being said, in my experience I gave my "seller" my account number since I had no issue with trusting him)