Or anything, really.
When I worked sales (non-commission, thank goodness) I was often in a situation where management wanted me to push certain products. I never felt comfortable with it, and ended up being told repeatedly that I needed to do better.
Luckily, I was incredibly good at helping people buy what they needed, and so I sold a lot of product, and management didn't want to rock that boat. I even had people who would come to the store, ask when I worked, and then come back later to get me to help them instead.
I attribute this to being knowledgeable about the products and, as you said, never trying to convince anyone of anything. They asked questions, I answered them with as much detail as they wanted. Super simple for me and never hurt my conscience.
The problem is that very few of the other salespeople there understood the products to that degree at all. They learned everything they knew from the sales stickers, boxes, and brochures at the store. They knew nothing that the customer couldn't discover if they spent enough time reading. It was still helpful because they could get the customer to the rough area quickly, but not much beyond that.
The company did not pay me enough for the service I provided. I was there until I got a better job and that was all.