Caterer for venue won't let us provide our own alcohol
My fiancé and I are having a little trouble with planning for our wedding budget and wondered if anyone had any similar experiences or advice. When we booked our venue we were told that the caterer would provide the food, fizz, wine for meal and bar at reception. My fiancé works for an alcohol company and can get really good deals so we wanted to stock the bar ourselves but pay for staff service. We thought this would save us money and the venue told us that plenty of guests have done this before. However, now the caterer is telling us that this isn't an option and it's not open for discussion. We're really disappointed because we were factoring in a big saving on our bar costs. Before we go back and argue with them, we're trying to understand what their motivation is? Does it just cause them hassle or is it because they make a lot of money from the bar? Is it a lot of hassle for them if we are planning to order and deliver the stock the day before the wedding then collect any excess. We can still pay for the staff to serve alcohol so it's not like they wouldn't make something out of it.
Any help much appreciated!