Ok I just went through pages and pages of the member list, sorted by # of posts. I found no one that seemed to make sense with your picture. The ones that start with pi or pie in their name tend to have rather short users. So yeah...
I assure you, such a member exists and has the second highest post count of all the members on this list. I admit that this was the most difficult but this is solvable.
If you want a hint with 10 (seems to be troubling a few people), the 3 images are separate and go in the order "numbers", "man", "card". Figure out what each one means and put them in the order and you should get it.
Don't know if this will help or if you've already given up on it by now and just want the answer, in which case sorry
