Can't we all Just get along?

OK, I guess I feel a rant coming on. Help me, can't sales be a team sport? I'm not talking about those sales jobs that don't have protected territories and such. I realize those folks have to fight to put food on the table. I have two gripes about sharing.
First is non competing sales people in the same territory, especially those who call on the same industry.It used to be that you knew other salespeople with other products in your territory and if one of your customers were looking for something, you could tell them about your friend, or call your friend, and tell him about the opportunity.We would share contacts and other info and we all came out ahead. Since I've started with my new company about a year ago, and I have tried to build bridges with three different salespeople that I know who work in the area and call on my type customers, but no takers.Why can't we work together?
The second problem is within my own company. We don't seem real good at sharing information that would help us all. The territories are protected, so the salespeople aren't taking a chance on losing a sale, in fact, we often call on branches of the same business, and working together would help to provide consistent pricing through the company.Another gripe is if a sales person is going to poach in my territory, because they have a connection they want to follow, then call me and tell me you're coming in, and why. I always hate to find out over the back fence when I call on the person and they tell me they have a relationship with someone else.
In past sales jobs, I've been a mentor to new salespeople that started out, they would do ride along with me, and they could always call when they faced a problem. I had relationships with the salespeople in adjoining territories, and we would talk or have lunch together almost weekly. If I figured something out about our product or services, I'd share it, and they would do the same. It seemed to make us all better, and made money for the company and our 401K. Why isn't that happening any more?
Maybe I'm old fashioned, but I'm someone who is proud of the profession that I'm in and want everyone who is part of our industry better and more successful at what they do, what's wrong with that?