Games on Steam do, afaik, make outrageously more money than other sites. Putting a short finished game for some immediate moolah isn't a
terrible idea, albeit they are perhaps a bit optimistic on return. Making the sprites for characters can be most of the work on shorter 2d games; making original sprites is decidedly
not a reduction in work-load. If they're putting in this much effort they probably should have just worked on the game that had all the sprites done (twice) and people were
already paying them for. Maybe split DBA into chapters and put up DBA: Starting Out or whatever on Steam. Honestly, there's probably an element of creative burnout, writer's block, perfectionism, an artist being a diva, resentment toward their creation, or DBA's code being an unwieldy mess in this decison.
On a positive note, if Lust Planet
is a one-and-done complete release, the chance they go back and waste effort to make the sprites worse is much lower!
But never zero. 
