Personally, I got most of my HD's for between 60-75, so if I were to sell TODAY, I'd still call this a huge win. I sold my Uruk-Hai Armies this Christmas and did fine, but they are $20 more now than they were just 5 months ago. My basic strategy involves 2 years after SAH availability, and Helms' Deep is November of this year for that mark. I have no doubt these will hit $250, and rising more than that I don't think is out of the question. As far as when to dump. the same kind of applies to me - Alien Motherships are the most recent set I "dumped" (and basically broke even) - This past holiday season. Same deal, they passed 2 years retirement, and really hadn't moved. I gave up. 7962 PodRacers were kind of the same deal, they just didn't move much over the last year I had them, so I moved them (still at a profit) but not as much as I planned when I bought them. Monster Fighers will be hitting 2 years in Nov for the most part too, and I admit I am pretty surprised/disappointed in this sets growth. I felt it would do better than it has, but similarly, if I sold all of my stuff I'd still make some money, just not quite as much as I had planned. We'll see how it goes this holiday season. Obviously, needing the money for other investments is a factor as well. If I really feel money would be better spent elsewhere, I'll make a move. But as part of my general business plan, I'd rather make X amount of percentage on my purchase as opposed to needing to sell after a specific date - but I think that plan really requires more of a devil may care attitude and more cash reserves than I currently have. And there are exceptions, Tie Fighter 9492 had only been gone 8 months by Christmas, but I moved all of mine because I tripled my investment. I figured that was pretty good, and maybe the set will contiue to grow, but I doubt it will grow much more that it made it worth holding on to at that point. I felt the growth of other sets would be better. I assume everyone has their own plan and goals and thresholds. Some people I've noticed dump stuff really fast, others dont mind holding on forever. There's opportunity cost and time cost to factor in to constantly flipping, or holding on to sets. As I've said several times, I think it's most important to simply have a plan and some numbers to prevent yourself from overspending and getting into a tight spot. The worst time to sell (or buy) anything is when you need to.