Not only should you ask for the green fees, you should consider asking them to cover their food/beverage purchases made at the course as well. Simply say something to the effect of, "Hey, you guys wanna play at my CC this weekend? The green fees would be $___.__ per player. Also, you can't pay for your round in the pro shop as well as any food/beverage ordered at the course because all expenses are billed to the member. So, you have to bring cash and pay me. In turn, I will pay the bill once I get it." This is what my bud did the first time we played his CC. We've never had a problem.