Yes, I did this about 100 times in a row, kind of quick. The point is, every time I ended the conversation with Mother and then ended the contract by doing this, it would put me further down 'the list' of contracts.

I entered the same string AGAIN and hit enter and that ended the murder part. That would end the part of the quest where I'm talking to the Night Mother and I was again supposed to do the contract. So in the console, I hit the 'up' arrow to re-enter setstage dbrecurring 200 and again hit Enter. It ended that individual murder/quest and then it went back to asking me to go see the Night Mother. So I stood in front of the Night Mothers coffin, called up the console (`) and typed setstage dbrecurring 200 and hit Enter. But I thought to myself: can the programmers have made an endless loop? That would be lame since they'd start completely repeating. This forces it to complete, but then what happens is that the Night Mother calls you again for the NEXT contract (because it only kills the current contract not the entire quest). Like FeralChimp said five years ago, you can use setstage dbrecurring 200. Actually, you CAN 'kill' this string of pointless quests.

Skyrim the dark brotherhood forever