First off, antique pipes, are a lot like cues. The real good ones, ironically some are ivory, still have a great ceiling. But ALL collectible markets have been hit, but mostly because of the economy. People who stopped smoking didn't help, just as people who have stopped playing pool haven't helped pool. (neither has the anti-smoking campaign helped pool)
Its like saying baseball cards took a dump because of steroids, not true. A glut in the market place, lack of interest, and collectors started realizing their retirements were not going to be on the back of Derek Jeter.
So many cues have ivory, all deals will still take place, and out of site. We all have e-mail, deals will get done, all will go on.
You want to stop poaching, make poachers heads, per pound, more than ivory, and it will stop.
JV