Let's have a little fun. This one occurred to me recently, maybe you got some others to add:
1. Your collection (or items) will always sell for less than what you paid. (Remember, you where the highest bidder).
2. If you spend 10 years looking for a specific cuff, there will be some available for much less just after you spend your savings for one.
3. The one you let get away will never come again. Not in a thousand years.