Why wouldn't you? When investing in particular vendors (especially those that are a priority item for your big day), you should not only look at their cost and experience; you should also pay attention to if that particular vendor invests in themselves as well!
A good vendor should be a student of their own craft, especially in this ever-changing, ever-evolving industry. Pay attention, and ask questions. Do they constantly train and educate themselves on what they specialize in? Study latest techniques, products, etc? We sure do!