According to Zistle, a site that I love (except for some programming bugs affecting the count), I've surpassed 15,000 unique Reds. This is a lot. The speed at which I acquire has slowed down, as I've pretty much locked up all the cheap base cards from the history of the universe. This has caused me to start other projects, which is a horrible idea. Anyhoozle, here is lucky number 15k...
2015 Topps Heritage High Number Combo Cards #CC-3 Reds Partners. Picked this up at a card show for a quarter. Nice. Now, how did I determine this is number 15,000? It was likely not the 15,000th card owned, but it was the 15,000th entered into my database. But as mentioned above, it might not even be that, since the programming bugs mess with the count.
However, now that I've posted it, it is official. Number 15,000. Yea to me.