Andy, Here is my biggest fear for you
-If you sell products that you use, and everyone else can buy.....why am I going to buy them from you instead of auto zone or pep boys or the internet, etc? How are you going to leverage your companies competitive advantage by grouping together products? Will you have the price advantage? Convienence? Or.....(hypothetically)do you give access to your video collection of how to properly detail a vehicle, with proper instructions that you can watch on video? Bottom line: How are you going to add value to everyday products?
I think that doing a car show/detail shop is a damn good idea. I think it gives you a proper venue to not only showcase your skills as a detailer, but also give them the tools to show people how to do it themselves......and I think in the long run, some folks will have more money than time and have you do the job.