I don't know what you sell, I sell Med Supps. I would never consider setting an appointment with a prospect unless I know how much they are paying per month and without telling them exactly how much the premium/savings would be if they take a policy with me.
That would be to do a "Medicare Review" and those are mostly going to be a waste of my time.
Telling them the premium prior to setting the appointment probably works best in the senior market.
I would rather run 5 appts per week and sell them all then run 15 and sell 5, just my opinion.