Mary
the world of pin trading is so much fun!!
i, and my family, view pin trading as just that -- FUN! definately there is a market for those who are collectors, i just happen to not be one
that said.....
browse Ebay and find a 'lot' of pins that are official "Disney" pins and purchase prior to your trip. now you have a bundle of pins you just don't like; pin them on a lanyard and go on vacation. any CM with a lanyard (except I think green which is available for 12 y/o and younger , i'm sure i'll be corrected if wrong) is available for trade. As long as that CM doesn't already have the pin you wish to trade, they must trade you (hence, no duplicats on CM lanyards) I try to finds lots that equal $2.00 or so per pin once shipped.
note -- buy pins you don't like so trading is FUN!!!
it's my understanding that pins that are eliglble to trade have "DISNEY" stamped on the back. there are pin-trading sessions on-board. passenger-to-passenger trading is ok as long as both parties are agreeable
i find it fun to pick a theme for each trip, I have done "Mickey and Minnie" searching for more vintage-looking pins; Donald pins for the half-marathon, and in November I plan in trading for Pixar character pins
hope that is helpful -- visit the collectors board for more info