IMHO, the only contracts I would buy on the resale market would be at VB,HH, BCV or OKW. For the the others, you save very little money for the headache you get and they are generally available through Disney right now for 89 per point. You may have to go on a waitlist, but when the points come in. and your use year begins after the month in which you purchase the addon, you get all the prior year points.
For example, to add on 150 points at the BWV with a September use year today, you would get all 04 points, prorated mf's and all 05 coming in September, for 89 per point and no closing costs. I did just this in the current year. 16 days on the waitlist.
If a resale contract has all 04 points, and all 05 coming, and is priced less that the 89 per point with all the closing fees, then you will start to save money over purchasing through Disney. Not alot of BWV contracts have all 04 points intact, and there are not alot of them anyway. And, lets face it, if you save 3 dollars per point, on a 150 contract, that is 450 over the next 35 years or so. Is that worth the !excitement! of the ROFR? Everyone will have their own answer to that.
For VWL and BWV, and obviously, SSR (because of the current incentives), I would go through Disney or at least get on the waitlist for VWL and BWV until I found the right contract. For OKW, HH, VB, you can get a savings on the resale market, and in some cases, substantial savings at VB.
For BCV, the waitlist for those points at Disney is incredibly long, so, I would, as others are doing, snatch those up on the resale market, pay premium over the Disney price for sold out resorts and just grin and bear it, if that is where I wanted to own.
Well, there is my two cents, and I bet some would agree. However, I am sure others would not agree. I plan to add on both ways in the future and I hope, as an owner, that the price per point continues to rise for quite some time in the future.