Consider that the employee who makes only vague promises and demands unlimited concessions, seemingly without regard for the owner's interests, is likely a viper a la Aesop [1]. I've made this mistake before.
2. My experience is that typically employees are more concerned for their employers' interests than employers are for their employees'.
3. In Aesop's fable, the farmer helps the viper out of the kindness of his heart. I have had some good employers, but not once have I had the impression that they were employing me just to make my life better rather than because they hoped I would do work for them to their benefit.
Many individuals assume it's their privilege to be employed by you.