As a graphic designer for a local Sign Company, and someone that has been in signs for about 10 years now, i'll put my two cents in here. #1 It is really hard to talk a business owner out of a bad idea, believe me I've tried, especially if they came up with the idea or logo themselves. #2 A lot of business owners starting out forget to put a budget for a sign into their plans, its usually the last thing they think of and they want it at the last minute and have nothing in their budget left for it. #3 you would be surprised at some of the terrible ideas "artists and designers" come up with and then leave it to folks like me to figure out how in the world to make it work, design agencies can cause quite a mess on the sign front.
and on the Blair Jewelers and Sunrise Spa...those are both terribly uninspired designs and about St. Clair doing good work, most if not all of their manufacturing is subbed out to wholesalers.