Right! There's no WAY I'd try to sell a sound bar/system to someone that has a nice Onkyo, Denon, et al receiver and is already all setup. Now if you have some old Analogue iLive or something, we'll talk lol
Fortunately for me, I used to sell Home Improvements back in the day so I'm comfortable talking to people anyway, creating rapport as soon as they open the door and I try to have as much product knowledge as I can, but you are correct, many techs are not salesmen, aren't even socially adept but are under immense pressure to sell. SO my point is don't take it out on the tech, like you said, he probably isn't comfortable offering things and doesn't even want to do it anyway