How about change the name to this:
"The how much would you pay today if you decided you wanted this item and had the funds readily available to purchase it forum"
And there is only 1 rule.
If you dont know what you would pay for the item at the time of your posting, because you are concerned about it's value, then you are not allowed to post anything.
So that was actually sort of, kind of, a joke, okay? Everyone see's that right?
And of course, this is not a commitment! But only an honest, yet completely hypothetical response.