there is certainly a demand for GREd releases, if you go on soulseeek and search for them you can get pretty much the whole back catalogue. only problem is they are mp3, have no sleeve, usually imperfections in the sound and you cannot hold them! Good for previewing tunes you want though.
I rang them up one time to ask whether they were intended to repress the Johhny Osbourne album Never Stop Fighting, but they said it is often had to find the original masters, stampers, cover art etc and it is a lot of work. However, as you point out they have one hell of a Roots Radical back catalogue of essential tunes, i'm sure they'll notice it soon.