I used to be into antique clocks in a big way years ago, restoring, collecting, selling. Then oneday my wife got t-boned in a car accident, we couldnt collect insurance, and we lost income. I sold my entire collection to get us through it. Thing is I still like clocks, but have no desire to build a collection again. I guess times change us, and we are sometimes forced to move on. But you are right, its easy to build a collection of pins again, but know that you may not find some titles easily.
Goodluck