I think it's a fair question. It's also fair to ask them about the company's weak points, why people have left, etc. Interviewing is a two-sided process. Maybe

I think it's a fair question. It's also fair to ask them about the company's weak points, why people have left, etc. Interviewing is a two-sided process. Maybe my arrogance will be a problem for them. Maybe their widely fluctuating revenue will be a problem for me. We both have a right to ask.