Well, just like radars...
My BEK 2003 radar, is it worth $30, or is it worth a few hundred more than that - like Cat. value (and maybe plus $30)
I think in cases like that, the "premium" is less of the focus, so should carry less weight ofthe price.
Radars, missing circles, and other side stuff like that all kind of get similar pricing schemes, based on the market and how people respond to those notes for buying and selling from what I have seen.
Low FEE Missing circle for example-- Just take into account how many there are (possible). Take that versus the FEC missing circle, which is more common I believe.
More notes= higher supply= lower price (price also due to item's popularity of course)