I'd save the questions for the offer negotiation, but most of the equity questions are reasonable. I can understand someone not telling you the revenue/cost numbers, and that's where your due-diligence on the company/gut come in.
At the time it seemed like the only fair approach. We founders honestly didn't know that most startups tell potential hires as little as possible about company finances.
Knowing what I know now, I'd still tell folks this info as it unwittingly gave us a hiring advantage over companies that don't.