Very cool for him, but like others echoed, I would imagine a lot of duplicates. Still, if that is your goal to reach a billion, then I would imagine that would be the only way to do it. Currently the database has just over 4.6 million baseball cards, so imagine if they were all unique, it would be easy to add them all here. While it never mentions it, I am curious if he does collect other sports or non-sports. I'd also be curious how he currently stores them, I would think even a shed like they propose to build for him would be too small. I have under 40,000 and that takes up plenty of room, I'd never want to hit over 50k, much less a million and that's for all sports and non-sports.
Then again just imagine how much money he's sitting on with all those Uribe cards he probably has.
Royal Card Review is my blog if you feel like checking it out, thanks if you do!- royalcardreview.blogspot.com/
In the process of updating my collection so don't trust any of my lists right now.