We have been pin trading since December 1999 and love it! It is a great hobby for the whole family, and expecially good for children (it helps them to approach adults -CM's- and practice their manners and eye contact). As others have said above, it CAN be highly addicting. When our DS was smaller (he is almost 10now) we learned the hard way that we had to purchase multiples of the same pin if we wanted him to trade. If we offered him 10 different pins, he would just remove them from his lanyard and say "I don't have any of those in my collection". I REALLY helps if you can find a focus, a particular character/s, or attraction pins, etc. Our DS has "narrowed" his focus to "any Disney pin with a point on the back" -LOL!
Feel free to PM me if you have other questions. I would be happy to help!
Suzi