Just to chime in...the CM's at WDW have no idea whether you purchased through Disney or resale. So they will treat you the same as they would treat any other member.
We bought one contract through Disney, and one through resale. Even I can't remember when I'm using one contracts points or the other, so I'm sure the CM's don't know either!
I would not hesitate to purchase either way, depending on where you want to buy and what your preferences are.
To me, in addition to the money, the biggest thing with resale is number of points and "condition" of the points. Buying through Disney you can name the exact number of points you want to buy, minimum 150. If you want 217 points, you can buy that. And once you buy, you can start using them quickly.
With a resale, you have to purchase whatever the contract number of points is available. True, there are a lot of contracts with varying points, but you have to choose from among them rather than naming your specific number of points. Also, the "condition" of the points on resale contracts is all over the place.
Some contracts have used up all of this year's points. Some contracts have used up this year and next year's points too (by borrowing). Other contracts have a bunch of points available now since the owner banked points from last year. Also, you have to see if the points available now can be banked or if they must be quickly used or lost.
So resale takes a lot more research, and figuring out a good price for the contract. But it can be well worth it in financial savings.
Good luck!
