rusty,
"It's a fine line between a large shrub and a small tree." (Gary Lauver, 2012)
I believe the miniture rosemary christmas trees are grown and shaped specifically for christmas sales. It's a marketing gimmick, plain and simple.
That said, rosemary shrubs are a truely great plant. They live to be 100 years old with just minimal maintenance. They are evergreen, drought hardy, can handle summer heat, and yet are also winter hardy. They make an excellent ornamental speciman as well as a culinary herb.
I have three rosemary bushes in my yard, one right outside my back door so I can get to it easily when I'm cooking. I also recommend them all the time to my landscape customers. And, none of my customers have ever complained about these low maintenance plants.
Time will tell, but rosemary may just turn out to be a good wood stock to use for making replacement Perfect Handles. Stay tuned....