Can you not expand further than "The fact is Gold gets priority on the network above cheaper products" which you keep telling us? I'm afraid you are the one going around in circles if this is the only answer you can provide. Are you simply unable to prove this to us?
My source of information is this very forum and posts, in their thousands, since September 2013. The fact that hundreds of Gold clients complain about poor daytime speeds and shaping, the fact that hundreds of people on lesser accounts don't have daytime problems and get better-than-Gold performance during hours. There is no consistency if this is the case.
I have even recommended OpenWeb Gold to friends, only to have them disappointed after a couple of months, and cancel.
And just because my source of information is thousands of posts on this forum over 6 months, does not mean that it doesn't apply to the non forum participating clients. I am not trying to account for ALL Gold clients, it's something I cannot do, but it's a damn good indicator. Why would ALL your other Gold clients be any different? What you are suggesting is that Gold problems are unique to MyBroadband members, which is absurd.
And quite honestly I don't think you could account for ALL your Gold subscribers either, since there is a strong chance that they only use their accounts after hours, and don't understand that they could go with a cheaper account for the same after hours performance. They think that Gold is giving them a better after hours experience, when lesser accounts also become unshaped after hours.
So, why Gold?
Prove to us how Gold accounts have superior performance? Please.