Loads of reasons, some of which have been given in this thread by various users. I didn't want to specify exactly what, because it varies from each user.

What is clear to me is; there was a real community drive a few months ago to concentrate on removing the spam as a community, and that was fantastic. However, recently as outlined above in this thread there's been a shift in mentality. I think reporting badges are more important now, than when they were proposed so I would like to see these implemented sooner rather than later, however I don't think they are a permanent fix, and rather patching an issue up for a little while until the regular reports have achieved the highest level offered.