Alright, now to get back on topic here (lol), it looks like I made a mistake. In my original post, I stated that Crosby's The Cup Rookie is going for $3,000 - $4,000 USD, however, those sale prices I came across were for the Gold version (#'ed /87) and not the base card (which is #'ed /99). On April 28th 2016, PWCC sold one example for almost $11,000 USD. Here is the link below:
https://www.pwccauctions.com/item.php?item_id=1272819
According to my research, majority of hockey collectors collect the base cards, so this is why the one #'ed to /99 (a base card and his true rookie) is worth 3 - 4 times more than the gold version (an insert). Check this thread out below:
http://www.blowoutcards.com/forums/h...much-less.html
So it looks to me as if the prices have not dropped over the years. The gold version has gone up a bit, and I am going to assume that his base card is probably worth $12,000+.
Anyhow, McDavid's cards are still going for more and I still find this surprising considering Crosby is currently the best player in the world with 3 rings.