CO
cobbles
channel - managed to obtain repeat rights they could get some high quality versions of the show to broadcast or see the light of day. I think this is why I and so many soap fans feel short-changed, thousands of ongoing dramas have had such releases but soaps have been left to rot in archives for years. It's about time they were treat as the iconic archive of British television they are rather than disposable shows to be thrown away.
Sitcoms are made and designed for repeat viewing. Soap isn't, its designed to be watched over multiple (consecutive) episodes and you follow the story. In sitcoms episodes are mostly (but not exclusively) self contained and can be seen in any order - they're not dependent on knowing that Velma stuck her head around the door and saw Fred bonking Daphne six episodes previously. That's what makes them more suitable to be pushed out on DVD as opposed to soap.
As an addendum to this post that still doesn't explain why they're willing to release drama programmes that go on for hundreds of episodes and require the same narrative path of requiring knowledge of whats gone before but not soaps.