I don't buy the Greenlight Precisions, just the original Precision Miniatures. The Greenlights have definitely brought the prices down on the original Precision Miniatures, which I appreciate. With me, it's all about condition, not having been displayed, and in the original boxes. I now have the '59 ambulances in red/white, blue/white, & red/black(Chicago). I think that the white/white is as rare as the blue/blue. I have many of the hearses and combos as well.
When I listed my last house for sale back in 2002, I told the listing agent "No open houses, no lock box, and they personally had to be present for every private showing". It was the only way that I would list with them. With a lock box on the front door, you are basically leaving the front door un-locked! They accepted my terms and they were successful in selling it!