The Eternal Question: To Open or Not?

There really are only a couple types of collectors. Those who keep their die-casts unopened (or "on the card" or "mint in box") and those who open theirs. Here's my trade drawer:

These are mostly duplicates or cars I bought hoping to trade.

And here is another drawer:

I'm a person who believes in opening all the die-casts, but I keep the ones I hope to trade on the card. What are your feelings on the issue?