I am totally missing the point of the 'secrecy' being invoked here. Are folks embarassed that they are sticking it to Hilton with $0 rooms? If so, I have to wonder why.
If one has no moral problems with what one is doing, then be proud. Proclaim it from the highest mountaintop. Or admit that you are being sneaky and be ready to let it go if you are called on it.
We all do some things in travel and in life that we know are not right. Take the UA upgrade bait and switch. Sure, I try it. But I dont like to talk about it. And if it doesn't work, I dont go crying like chastity raped.
Of course, the reason is probably that folks are worried that if the world (or, specifically, the service provider) finds out about the loophole, it may go away. OK, but just remember, the only way two people can keep a secret is if one of them is dead.
I'm glad Travelmanken brought this up. Nothing like shining a little light on a topic to make the roaches scurry...