If the person simply just posts something to the extent of "Yeah as the person above me already stated." Without adding on to their reply with other suggestions it does seem like they're just seeking a post count boost.
In the case that a person says "Yeah as the person above me already stated. (plus their own suggestions)" I see it as their way of just trying to acknowledge the previous posters suggestion without seeming like they're trying to overide what the previous poster suggested with their own suggestions.