There are so many factors that go into your question. First, I think it depends on how many points you'll be adding. In order to qualify for Dis incentives, there is a minimum purchase requirement. I'm not sure if it's the full 160 points, but when we looked at adding on 25 - 75 points, there was no benefit other than the points would be available sooner (would have to wait like you do through resale) AND Dis doesn't charge closing costs.
Personally, we ended up going the resale route. I don't know if this is a benefit or not, but when purchasing resale, you can purchase any UY. Dis will only sell you your current UY. Please note, different UYs act as separate contracts and stand alone. Let's just say that you have a 100 point add-on and you stay a few nights and have 20 left over. If the 20 points can't cover a reservation, you cannot combine them with cash to cover the night and the only way to combine with your other UY points is to transfer points from one contract to the other. You can only do 1 transfer a year.
Last I read, current incentives were in the $8 - 10 range. Plus, if you go through Dis, they were still offering 2007 points if available. If you watch resales, though, you can get loaded contracts. You just have to wait and act fast when they come along. Our 120 point contract had all 2005 and 2006 points banked plus all 2007 points coming for $84 a point. This was actually better than Dis's F&F 15-year anniversary promo, which was $86 per point + current UY points.
I was told by a couple of resale agents that now is a great time to watch/buy because people do not want to pay upcoming MFs. I would call Dis, price the add on and then watch the resales. Pull the trigger either way once your comfortable with your research and have had an opportunity to see what you can get on the resale market. Lower point contracts do seem to fetch a little higher price per point in the resale market because there's a higher demand.
Good luck!!!
