True sales is just filling a need, sometimes the customer knows they need it but others are unaware of it. Good sales reps will not sell something unless it makes sense for everyone involved.

I got a sales job offer on the spot by first highlighting the limited use of a single pen and without extra’s on hand its negative business impacts. Then stated I had tons of pens available in my car and positioned selling them at least 100, but recommended they acquire 1000+ as this prevents potential issues plus gets them a better deal. Pretty solid approach in my experience.