We don't have a reason for not doing it, just nobody has done it yet. The walls of fame in those forums were created by whoever was bartender in those forums at the time (wow, that was a convoluted sentence ).
Since the walls of fame are on wiki pages, you could create a wall of fame for the SCEA forum, and once created I will link it to the top of this forum. Just use the existing ones as templates.
Alternatively, remind me on Friday and if I have time on the weekend I might do it. If I don't, keep reminding me on subsequent Fridays until I finally get around to it.