I think it does make a difference.
Regardless what the individual might think, there are people who post solely to increase their post count. Anything that can be used as a measure against someone else (in this case, post count) will inevitably be used by some as a form of competition. Some might say it was human nature.
I'm guilty of it myself. Wondering how people have so many posts so quickly and what their motive is; or seeing a post from someone that is pretty shocking and thinking "dude, with that many posts you should know better".
I went for Infrequently/Does Change as it's the only one that really fits my view.