What's so confusing about the OPs little rant is how misplaced it seems to be. In the story, you have two musicians: one trying to buy an amp, the other trying to buy a bass. Both are trying pretty hard to buy them from a local store, which seems to be doing their best to anger both clients. The story does absolutely to support the OPs pre-designed premise that "window shoppers" are killing mom and pops. In fact, it does the EXACT OPPOSITE.
I recently went into a local vintage music store. I spent 45 minutes looking at different instruments. Since all of the amps are in separate "demo" rooms, I twice asked a clerk if they had a bass amp I could use. Both times, he tells me "sure, bro....give me a minute", then disappears. I got tired of waiting, and left. As I'm walking out, the owner of the shop gets snippy and quips "hope you enjoyed screwing with all of our basses"...... I came back to the counter, pointed out the clerk who was "helping" me, and told her I tried very hard to buy one of her basses. She told me to get out........
Another local store was quite helpful when I bought a bass last year. When I got the bass home, I realized it had a minor issue. It would have been a 5 minute fix for a luthier, which the shop happens to have on staff. When I called them to ask them to fix it, the manager says, very sarcastically "man, that's rough. Maybe, just maybe, you should be calling the manafacturer for your warranty claim???"
Yay mom and pops. They've been killing their own businesses for years, and now are trying to blame the "big boxes".....