You can get some coherent tunes from this if you read it backwards, ie. DADGAB is a useful tuning. I've got a couple of old blues songs that were originally in DGDGBD which I play in DADF#AB - the key of D to suit my vocal range and the B to compensate for arthritis slowing up my fingers. I have determined that these tunes and a lot of others could be played in DADGAB, and I can see that it might occasionally make the fingering easier, but the only other reason I can see for using this tuning is to confuse the unwary guitar feelers who just have to pick up your guitar and strum it the minute you leave the room.