That's funny. A long time ago I bought a float tube from Walmart. It just came in, had a ton of features and the price was right. It was my first tube so I grabbed it up right there. When I looked at it, the tag said pump it up to 3 PSI. I thought it seemed too low but that was ok because I was going to the sporting goods shop I enjoyed the most for some new spinnerbaits. I'd just ask him. (We only had two) When I got there I found my lures, some line and a few other odds and ends. When I got to the counter I put my stuff down and asked "Hey by the way, I just got this tube but it only called for 3 pounds. Does that sound right?"
Well Holy Hell, he went into a fit of rage about me asking for free advice. If I wanted a tube he had just as good a unit right there I could have bought, (it wasn't) and got all the free advice I wanted. He wen't on and on. I left and never set foot in there again for about a decade. When I started to go back, he was a nice guy again. But man, what a way to lose business.