@teamseaoat:
I agree with you that I would prefer my travelbugs to travel to many caches and through the hands of lots of people.
But there a lot of reasons for not dropping a TB in any cache you find. Sometimes the cache containers are to small to pick up a TB. And I personally would think twice about dropping a TB in a cache that I think is very likely to be "muggled". And dropping TB in very difficult caches could also keep them from travelling... And up to the moment when a cacher finds a cache he thinks is appropriate for a TB, the dropping/retrieving-action at least gives them some mileage and the owner knows, it's still alive.
Dani