cmay once bubbled...
You're missing the point Genius, I mean Genesis. I'll use your DUI example. That $300 is crucial. Let's say that LeisurePro only profits $100 per suit. They might sell 30 per month. That's three grand in their pocket and only the overhead of maintaining a website and a small "showroom". A shop like Mike's may sell a couple per year? (I'm guessing here) When you start adding up rent, elec, insurance, etc., etc., etc.. You cannot offer competitive prices and stay in business. With regard to air, you are focusing purely on the tank of oxygen required to make the Nitrox fills. You are forgetting how much air costs the shop. You have the pesky oil changes, filters (definately not cheap), and the labor required to fill your tanks, and probally allot I am forgetting about.
/B]