Do you keep doubles of movies (i.e. Blu-rays and DVD editions)?

[drownsoda]

Recently I've been kind of assessing my collection of movies, and noticed that I've held on to so many DVD editions of films after I've gotten them on Blu-ray. Specifically, I accrued a lot of Anchor Bay DVD titles over the years, many of which were at one time extremely rare—the thing now is that a lot of these have since been reissued on Blu-ray and I've gotten said Blu-ray reissues, so I just don't know if there's a point in keeping the DVDs anymore. I think I've unconsciously clung onto them out of sentimentality, because at one time they were "holy grail" items in my collection, but if I have superior Blu-ray versions, I really cannot rationalize why I should keep them unless they contain some sort of bonus material that wasn't carried over to the Blu-ray.

My current thinking is that I should take some of these DVDs and sell them, and in turn use that money for more Blu-rays that I've been wanting. I've looked online and some of those Anchor Bay DVDs still fetch considerable prices even with the Blu-ray reissues available. Was just curious what others here did in this situation. I've kind of been in format limbo for years and retained a mixture of both, but am trying to purge what I have and make my collection a bit leaner, and the doubles of titles on both formats is inevitably going to eat up my shelf space.