The class itself seemed useful
What practical effect did it have that make you consider it to be useful?
A smart businessman is going to know how to value the deal, and it's going to be hard to significantly change his price.
If you buy a car in many cases a person with good negotating skills can achieve a better price.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.