A. Every time that I am forced to go to Wal-Mart is an exercise in patience and endurance (both of which I am sorely lacking). Fortunately, I am an avid people-watcher, and the freakshow abounds at my local Wal-Mart.
As for the diminished capacity of the guy/gal in Sporting Goods, don't be so harsh. The guy in Automotive probably can't tell you how to rebuild a carburetor either. You get what you pay for. Want expertise? Go to a specialty store...and pay extra for it. Heck, at lost those folks are trying to earn a living.
B. I think a boot knife is pretty much silly regardless of the length. Unless you are Grizzly Adams, in which case it is kind of cool.