Haven't seen this behaviour either on my own testing of Nintendo, Sony and XBox (yeah I have free time... ;))
I actually built up some user derivation rules to mask on Nintendo and Sony users a few months back to watch for these devices at a few deployed sites in my region. The rates are well distributed from what I have seen.
Example (far from the complete list...just provided a few to show how it's done):
set role condition macaddr starts-with " 00:09:bf " set-value Nintendo
set role condition macaddr starts-with " 00:16:56 " set-value Nintendo
set role condition macaddr starts-with " 00:17:ab " set-value Nintendo
set role condition macaddr starts-with " 00:19:1d " set-value Nintendo
set role condition macaddr starts-with " 00:00:95 " set-value Sony
set role condition macaddr starts-with " 00:01:4a " set-value Sony
set role condition macaddr starts-with " 00:04:1f " set-value Sony