First of all, props to Tootsall for mentioning my hometown!
Now, how many high school kids get to test their horn? Not many. How many get to compare it against other "stock" professional quality horns? Even fewer. Most horns are brought out to the band room by the local music store and that's what the student gets OR the student goes to the local music store (or catalog) and gets the first horn that's handed to him. Coming off a student horn, barring serious defect, any Bach is going to be an improvement. Most students don't know how to test a trumpet.
I think it's silly to even think that a pro walks into a shop, picks one trumpet, and buys it. My question is this: how many horns did that professional cull before finding a horn that is perfect or did that professional just settle for a horn that's good enough (settling for certain quirks because those are just part of playing that brand of trumpet)? The average man does not have the luxury or pull to get access to the vast numbers of horns (or possibly even better horns that have been set aside) that the pros do.