No, it's not. Even an average developer gets to pick between half a dozen offers when looking for a job. And his choice isn't always based on who pays him the most. Camaraderie and interesting projects also count for a lot.
It's trivial to have multiple job offers, and it is trivial to interview when you already have a job. You have to give the person being interviewed a reason to come work for you other than 'I sign the checks, bucko'.
So, yes, I want to know what the job is like, or I'm not accepting.