A Limited Edition pin that can be verified as authentic can increase in trade value or monetary value. Study of this facet of pin collecting can be very interesting in itself. I like to collect Limited Edition pins, commerative pins, sports team pins, and even local pins such as service pins, promotional pins and just pins that look cool. Pin collecting is a hobby that anyone can enjoy. Many pin collections can begin without spending anything.
Trading can begin with something as simple as a political button, and then grow from there.
Some pin collectors go after very rare and expensive pins such as Limited Edition Olympic pin sets autographed by Olympic athletes. Many times collectors can just be at the right place at the right time and walk away with an autograph and a team pin from an athlete, as I have done at times. Developing pin collecting strategies can prove to be exciting. Sometimes just plain luck can land a person a cool collectible pin as well. Some of my pins are favorites because of where or how I got them.