They predict a win-win relationship. No sooner have they cleared away the cocktail napkins, things begin to grind into slow gear. Somehow the momentum is lost. The relationship languishes. No matter how many other people have looked at your technology, you are convinced that success lies just around the corner.
Hope springs eternal.
I am an advocate of a rather novel approach. Forget about a non-disclosure agreement. Disclose as much as you can without giving away the store. Then, proceed directly to a technology evaluation agreement. One Foot Head Start in a One Mile Race Be reckless.