Unfortunately, the players involved saw the priority as preserving the market rather than as reducing emissions.
Similarly, the CDM market is pretty widely acknowledged to be a failure. The primary claimed goal behind CDM was to develop clean infrastructure for poor nations. (That is why it was called "Clean Development Mechanism," not "Cheap Carbon Credit Provider.")
I would add that that there are serious questions [PDF] about whether CDM carbon credits even represent net reductions, without qualified regulating project-based credit generation.
The evidence is overwhelming that CDM increases emissions.
The world's main carbon markets are all created... with ideological stakes in trading and those with financial stakes in carbon markets lobbying for the interests of these markets over creating actual emissions cuts. That should come as no surprise.
Read full from GAR at Grist...