the people buying from these guys get screwed twice... not only do they buy a crappy car, but being that it was purchased by a non-OMVIC dealer, there is little to no protection for the buyer aside from general contract law.
OMVIC will try hard to get the curbsider in trouble, but won't really help any of the "victims". after all, that's why they even put ads out there telling potential buyers to only buy from OMVIC certified people and businesses.