When I returned to school for my masters we were required to develop a program to help the community. We ended up developing a DVD program to enrich the lives of veterans and nursing home residents.

Once the word got out we received several hundred DVD donations but no money. But, since I had quite a few duplicates and triplicates (most of these came from my mom and friends) I sold some of those to buy the DVD players. If there are DVDs I'm not going watch any more I donate them to the nurses who still run this program.

I might have sold a few others - but I can't remember doing so. I have traded DVDs with other people but I'm more likely to buy them than anything else.

I usually offer my sister my old dvds first - for £1 each. Sometimes I give her something I think she might like. Then I trade my old dvds at Blockbuster for instore credit. Until Blu-ray I used to get between £1-£6 (depending on age/popularity)...but since BD I'm lucky to get £2.

I took 12 dvds in yesterday and got £6.40 in credit - and the most I got was £2 for The Incredible Hulk 2-Disc SE. Even my Terminator 2 Ltd Ed. Tin only got 80p.

DVDs just don't seem to be worth anything nowadays.

I'm selling the occasional double-dip via Amazon Marketplace.
The rest remains within my collection, even the movies I don't like.

I intend to sell off the "bad" movies, and things with poor transfers (e.g. non-OAR). I've been guilty of a few double- and triple-dips, and moving onto Blu-ray I'm continuing that trend. I say intend, because I've got over 50 titles set aside that I've not sold off yet. I've sold a few things, including Reign in Darkness and Spider Forest. Every so often I'm lucky... I was chatting with a mate, saying how tempted I was to upgrade the Riddick movies to Blu-ray. He said he wanted those on DVD, so we came to an arrangement. 

For Blu-ray "upgrades" (as opposed to first-time purchases) I've been targeting movies with dark scenes or big spectacles. I probably won't do a wholesale upgrade of everything, but already I've changed over many "key titles", including my fiancée's favourite film Mirrormask.

I don't see the point in holding on to poor transfers or movies I've already got. I have the remastered Mei Ah disc of Black Mask, so I'm highly unlikely to ever revisit the cut and dubbed local release. Similarly, once I've watched all of the movies on Golden Horror (cheapy boxset), I'm not going to watch Dr. Jekyll & Mr. Hyde (1920) off that... I'll watch the Kino edition! That said, before getting rid of the set (donate to a friend), I'll make sure I have a copy of anything (else) I like off there.

I'm even tempted (once I clear out the backlog of titles to dispose of) to prune my collection some more. There are movies that are fun and all, but aren't great/favourites. I'd like to improve the quality of my collection, because as it stands I don't have the time to get through everything on a regular basis anyway, and I'm always finding  new movies through various sources (public library, friends, family, cinema, hiring, TV), so it's not like my collection will wither and die any time soon. That, and there's an impending merge of (movie and book) libraries on the horizon (which will mean I'll have duplicates to deal with).

I employed a tag that reads.. 'to be replaced or sold' . this way I have a running list of titles to dump ..

I have sold a few titles.  Normally I just donate them to friends who I know would like the film.  Selling is too much of a pain and the local used joints really screw you hard.  I sold one for 5 bucks one and found it on the shelf for 40 bucks.  I'll just keeping giving them to my friends.

Quoting Lord Of The Sith:

Quote:
I have sold a few titles.  Normally I just donate them to friends who I know would like the film.  Selling is too much of a pain.

Same here. I have sold a few titles that I've 'upgraded' but I only tend to bother if I know they will fetch a decent amount (OOP titles (especially if I know there's a new set on the way that's better that i can buy with the profit), R1 hard-to-get stuff when I've accidentally been sent two copies etc.). Going through Ebay for the sake of a couple of quid just isn't worth my time and the risk of bad feedback if they don't turn up... or some idiot has bought an R1 off me and hasn't got a multi-region player because he didn't read the listing properly.

Otherwise I just give to friends/family, who I know will appreciate them, as a ferebie... though sometimes I'll be slightly less generous and give them as part of a birthday or Christmas present

I've got a tag set to identify DVD's in which I've purchased the HD-DVD or Blu-Ray version of, plus I have a habit of forgetting that I bought a movie and purchase it again in the next couple days.  (KEN!  iPhone version would help here!)

I plan on eventually selling/giving away the ones I've upgraded and I tend to give my brother any double-dips in the Blu-Ray department since he recently acquired a PS3.