First... let me say that I don't know beans about this sport. BUT
1. It appears to be hugely dependent upon what the dog brings to the table in terms of inborn characteristics (prey drive and nose) and nothing you actually teach. (I'm sure there will eventually be a behavior they're expected to demonstrate but... )
2. It's fun for the dog
3. It's a sport and they give titles and ribbons. (Hey! That's always a strong motivator for the handler!)
4. It's not ANY where as hard as what the people and dogs do in Agility, Rally, Obedience, Field Sports, etc. The dogs just do their thing.
Maybe it's something we'll continue working on. Who knows?