Artistically i don't see the point of an album release after these mastered sets. These showcase their skill and artistry in the live setting to maximum effect and also being in touch with fanbase thinking. Also, perhaps they feel isolated studio versions of the tracks take away from their sprawling, organic, connnected nature.
Its also very different to say, Pearl Jam doing a tour of unheard new tracks, releasing mastered versions of the sets and NEVER releasing an album of those tracks. That would be unheard of unless PJ suddenly started doing instrumental jams. Its the nature of electronic tracks versus songs and the concept of albums in that context. (I pick on PJ as they're known for mastering and selling tons of live sets )
But financially for Warp at least if not the duo, an album would obviously bring in some nice income. No-one can blame them for that, but in the interests of artistic integrity, i don't feel an album would work.