Normally I would agree. But gaming systems are different than other network applications. Most office computer systems are not individually used as revenue generators. Imagine a Las Vegas casino having to shutdown two side-by-side slot machines, just so that they could work on the one that is broken. During that entire maintenance period, they would have one fully functional slot machine that won't have a person tossing coins into it. That is the essence of my suggestion.
Were talking about cord connected equipment though, Pull the cord if you need to work on the computer.
He should use Spec grade receptacles, so maintenance on the actual circuits are reduced greatly. Maintenance should be scheduled off hours anyway.
He should also consider that there are computers that require a 20A circuit by them selvs - I know, I own one. THe PSU comes with a NEMA 5-20 Plug.
Depending on how far he wants to look in the future, he should consider more circuits, and stagger the circuits, so that 1,2,3,4 are NOT all on one and 5,6,7,8 are on another. He also didnt specify if this is single or 3PH.
~Matt