1) My skills are unimportant (except when they want overtime. Then, no noe else could possibly do the wonderful job I can!); 2) I am easily replaced (maybe by much cheaper contractors) and 3) My salary requirements are ridiculous. Only the top executives are worth that kind of money!
When I turn down an offer or even an interview over something ridiculous (What do you mean I need to sign an NDA just to be interviewed? Hell no!) they act as if I'm the unreasonable one. Somehow this never changes my mind.