As a player collector, you've got a choice.
Do you collect a player in secret? Do you collect a player and let the world know?
I have four player collections. For the most part, I like to keep two of them public and two of them relatively private.
Keeping a player collection private means that other collectors may have less knowledge about a young up-and-coming player. It also means that you don't have to worry as much about someone else holding a card for ransom as they know you really desire it.
On the other hand, keeping a collection private means that you have less help. The card collecting community helps to create a lot of friendships between collectors. When your player is pulled by another collector, the more who know, the more the chance is that you'll get an unsolicited note to help you add another card to your collection.
What do you do? I see the pros and cons... so I play both sides.