I like the idea, but I think you should keep the same set of questions for everybody. The only one that seems to be personalised is question 4. The rest could be answered by everyone. If people know what questions are in advance you will probably get more interest as people know what to expect and whether they'd be OK answering them. It will also be interesting to see everybody's answers to the same questions. Maybe people could propose another one or two questions that can be asked.

Just use calculators to figure out your profit: whattomine.com or kryptex.org/mining-calculator. Actually you didn't tell us about your GPU or CPU, so we can't help you here.