I would've thought sales numbers should matter less with MOD releases, now that they press discs with no expected time frame in mind as far as copies sold but now indefinitely available. Otherwise why go DVD-R at all and not just stick with standard DVD, it's supposed to be cheaper for them this way after all.
Some of those I'm hoping they'll get around to eventually, may fall in the less known category that's precisely why they should do them MOD being the perfect avenue. Archive releases shouldn't be a popularity contest, it should be a service for everything but mainstream titles.
Three titles I'm waiting for, The Mississippi with Ralph Waite (co-production with his own company), Kaz with Ron Leibman and King's Crossing with Linda Hamilton, would be rated rare shows undoubtedly but ideal for MOD and finding new audiences. The Waite show already with built-in audience via fans of The Waltons.