Yes, I join in fairly often.
Often MRAs arrive too late. 90% of the readers have come and gone and then MRAs arrive to "totally hammer with intelligent, factually backed comments".
The topic might be posted at noon. MRAs come home from work and read a comment about the article on an MRA board at 7:30pm. They post clever comments and those are just about the last ones ever posted to the article.
I am exaggerating the problem a little, but...