Games : Steam Fees - Dota/TF2/CSGO

Reference: https://support.steampowered.com/kb_article.php?ref=6088-UDXM-7214

I am confused.

There is a "Steam Fee" which is 5%, but there are also "game specific fees" for Dota2/CSGO/TF2 (each at 10%).

If I sell for CSGO for example, is the fee 10%, or 15% (10% game specific fee + Steam Fee).

Also, what verification documents does Steam require for big sellers?

Cheers, Jake