@OP What I learned about publishing sales is it's not really sales. Sure, you get a number, but your potential customers are already there. It's a captive market. You don't have to truly "cold call," you don't have to figure out how to get to a buyer, and you don't live and die by the monthly or quarterly sword.
That being said, it was a phenomenal training ground for selling a product about which you knew very little and discussing it with some of the smartest people in the field.
Being a publishing rep in the 60s-80's would have been amazing. Used books sc--wed it for the 90's but we made amazing money for what we did, even then. Little to no pressure. No one had any idea what I was doing on a daily basis. Make your yearly number and you were totally left alone....at least I was.
I met some really smart, interesting, quirky people in that business, and frankly, I miss it, but those days will never come back. I was proud to say that I worked in the publishing industry.
When I left the business, I realized that, aside from knowing how to discuss topics I knew little about, I had very little to offer. I wasn't technical, but I also knew that I was uninterested in the daily grind of cold calling and pounding on doors selling a commodity product. So started my own business and never looked back. This also has some enormous challenges, but at least I had my own freedom to do what I wanted.
That's the irony of a sales role in publishing. It's an amazing training ground, but you really leave with no transferable skills.
The interesting thing is that I've hired a couple of seasoned publishing professionals to work for my company. Neither worked out.
Its just a business that time has passed by.