I'll give you the short, and correct, and true answer Rob.
If you don't use them...sell them...especially if you don't want them.
I have to say I'm not remotely in the same boat. I've never been into conspicuous consumption (I'm not saying that you are), but I don't have 350-400 SD's. I find it incredulous when some members had in excess of 1,000 or 2,000...I just don't spend that kind of of time in front of the tube (screen, actually
). I have about, oh, I don't know, a little over 100 SD's...certainly less than 150. They are all in pristine condition, and I'd be willing to bet that I spent an average of $8-$9 per on them. If I were to sell them, what would I get? $1.00 a piece? Not worth it. And where would I get more than that? Almost all of the SD's I have are either classic movies, or very watchable favorites. Admittedly, having three times as many SD's as I do puts you in a slightly different position, and the law of diminishing returns holds true...but at what cost? What is your net loss were you to sell en masse @ $1.00 per?
I'm from the school where guys were modding their 5910's to the tune of $5k, even $6k. So when I hear some snotnosed pantywaist snivelling about dead format and the waste of $169 for an A35 (w/ 9 movies), it reeks of, well, spoiled brats. To see HD on a 120" glass bead screen @ 1080p/24Hz is what this hobby is all about. Admittedly, I have some movies that I haven't watched in a year, or two...or three or more. I guess I don't have that much money into SD's, the ones I have are desirable (to me), and unless there were some large return available...say $0.50 on the dollar, I see no incentive to sell off my SD collection just becaiuse it is inevitably to follow the plight of HD. That is classic conspicuous consumption. SD movies still play on an SD player (and always will), and can approach the quality of high def if mastered and transferred well, and upconverted via a quality chipset, and displayed at (and so on, and so on, and so on). And always will.
My advice? Sell them at any price if you don't want them.