To all those people being romantically sentimental about this thread I would say that a paid for gig is a contract between artist and audience which both have a responsibility to fulfill. The audience pays and turns up and the artist is contaracted to appear "as known". It seems Davey is mostly incapable of fulfilling his side of the bargain, whether it be by drink or long term drug abuse, or general ill health. Yes, we can all feel sorry for him and hope he gets well, but that has nothing to do with people paying money to be let down. Davey, it seems, is not being told that he cannot do the job anymore and it is important that bookers know this to avoid more embarrasment.
The person who should be dealing with this is the person who is selling him in to venues with a promise based on a reputation that is now being publicly destroyed by word of mouth and by threads like this.