I asked our DVC guide the same thing. He gave me several very good (IMO) responses that seemed to make sense, at least to uneducated me.... Granted, he's trying to make a sale so you may need to take it with a grain of salt...
1. Any liens or judgements on the property? Many times resales are the result of financial difficulties.
2. Who actually owns it? There may be more than one name of the property, and perhaps it's listed by one person, but the others may not be aware or agree with the sale. May not find out until it is too late.
3. Where are the points at? Some may have borrowed,etc. May not be a big deal, but need to be aware of it.
4. As mentioned, DVC finances.
5. No closing costs - FOR NOW!!!
6. Is the deposit refundable? If not, you may be out if you find problems like in #1 or #2 above.
7. With DVC's ROFR plus closing costs, you might not save enough money to be worth the hassle.
I've not gone through resale, so others may have really good answers to all those points. Just wanted to list what our guy told us. Hope that helps!
TJ