Not right, Sal. If you want beer at bar prices, sit and drink it in the bar. If you rent a function room, you pay for the function room space, not for the beer cellar or the drink coolers or the bar staff salaries - those are covered by the beer price, which has therefore to remain the same. Sure, you bring more punters in and increase beer sales, so you might be able to negotiate better rates for yourself. The keyword here is "negotiate", and that means beforehand.