This. Being able to buy at US Trade (45% off) does wonders for your profit margins. Of course you technically must have a brick and mortar store to do so. I have a local retailer that sells at 25% off. Could be a happy medium there. No shipping costs since it's local, no expense of the brick and mortar.
If you start small, this could work well for you. Just remember that your skill on the brush is important, but equally important is your business skill. Lots of great chefs have lousy restaurants.