They often err on the side of trying to sell you more, rather than less.
That is business, after all. I kind of enjoy it when someone tries to hoodwink me.
I was recently in a shop looking for a new basic bike computer.
Shop Owner: Can I help you?
Me: I need a basic computer. I think I'd like that one. (pointing)
SO: Might I suggest this one. (shows me one that's 50% more)
SO: It's got all the features of the other one, but starts and stops the timer when you start and stop riding.
Me: I thought that one had that as well (gesturing to the cheaper one)
SO: (hands me the cheaper one) See? The features are listed there. (points)
Me: (reading) So here, where it says AutoStopStart, that means something different?
SO: Yes.
Me: (supressing laughter) Hmm, I guess I'm not very technically minded. What does AutoStopStart mean?
SO: (hands the box to his employee)Can you help this customer with this?(walks away)
Fun times.