I think what would also be needed is a little explanation to people WHAT to listen for. Most don't understand, for example, what signal to noise ratio is. But, when explained, and then told what to listen for, it becomes very evident. Signal to noise ratio can be easily understood by listening to silent passages in a sound, and listen to the noise that is generated in those silent passages. The more "hissing" you hear, the worse off the particular unit is (and there are some very poor ones out there!) Now, alot of times, this can't be heard from behind a curtain, and the user should be very close.
There certainly are ways that people can be deceived when things are not explained properly, and fair comparisons are not performed.
Again, for anyone coming to the World Predator Expo, I will be covering alot of this, and explaining in more detail what everything means.