Consider the option that "negotiation" as a topic is a corporate fad. You hear a lot about it from the kind of people who try desperately to chase some kind of corporate game, but in practice, negotiation skills are not really that important in a work environment for the simple reason that these environments are by nature very cooperative. As long as you can get to clarity with people on what needs to be done, not much negotiation needs to happen. It's quite easy to spot the graduates of negotiation classes at work - they are the ones who waste everyone's time by practicing their negotiation jiu-jitsu moves when everyone else is just trying to agree on a project plan and get working. Maybe it's a virtue to not be one of these people.