They are looking for original content. If the content is duplicated then Google reduces the ranking. Reduced ranking results in showing up lower on the list for searches.
Yes, and since he/she obviously knows that, it concretely makes him/her a premeditated blogpimp for stealing another site's bandwidth and audience to "massage his google up higher".
Aren’t blog pimps allowed to post here as long as they post it in blogs?
In my personal opinion (not that anyone asked) the attacks on blog pimps are far more distracting and wasteful than the blog articles being posted.
Some of these articles are crap articles but some are useful and we’d never see them without the pimp doing his pimping.