If you visit the Privilege Club website, you'll see where the problem starts.

Here is one of the Gold benefits:

"Guaranteed Economy Class seat
As a Gold member, if you are unable to buy a ticket because all classes of travel are sold out, Qatar Airways will guarantee you an Economy Class seat, provided you book a full economy fare and your booking is made at least 48 hours in advance of the flight. "
http://www.qmiles.com/about_prog_benefits_gold.html?linkap20

So even if the flight is 100% full, a Gold Member can ALWAYS buy a seat in economy and be guarenteed a ticket, while other, less frequent travellers, will be bumped off.

I think we can say which sort of people this policy favors, and who it adversely impacts.