that is doubtful. The visa is valid for 5 years. You are not applying for anything new, like you are when you apply for an extension. I have entered 4 times now and no one has asked anything.
You pay the fee for each person, as they are different applications. I believe the main applicant applies first, then the dependents, but it might vary by embassy. Since the depends approval is based on the primary, do you want to submit the fees all at once and risk losing all the funds?