I agree it gets fuzzy when you factor in ebay. I was only using numbers from Bruce's sales. However, regarding the ones you would add, I would then remove both Blues Brothers and Caddyshack since I got both of those on ebay for way under $100.
This is why this current assessment is essentially impossible. Some people will pay less, get a deal, be patient, pay retail out of impatience, etc...
What some folks pay for something on ebay (past, recently, future) is never the same...its all so up and down that our efforts to gain any sort of clarity on said topic, to be extremely futile.