My company has a customer that has been housing material with us nearly free of charge (they are paying less than half of the annual cost they should be) since about 2004 when they started. The inventory of materials is a side business to our main act, which is using said materials to create samples for them to sell the materials. They started housing with us around the time we started giving this ability to our customers. Back then we decided this was going to be for the customers benefit and free for them (minus receipt of use of materials) because of the small amount they were storing. Over the past 8 years they have grown rather large and have started housing a LOT more with us. We have tried to get them to start paying the full payment of the material housing, but with each conversation, and each explanation of the fact that they would be spending MUCH more money to house this themselves or anywhere else than what we are asking for, they refuse and ignore the subject. The reality of the subject is that if they do this themselves, their freight cost alone would put them well over the amount we are wanting to charge them based on the frequency of how often they would have to ship the materials to be sampled instead of housing it with us. We have been toying around with the risky idea of telling them we will send it all back without full payment because we are taking such a hit for this (and we really are taking a hit). The only problem is, that the hit is smaller than the total amount of sampling we are doing with them (dollar order wise). So if we give them an ultimatum to pay or take the fabric back, we could take an even BIGGER loss by them saying "Fine, we will do our business elsewhere completely." Do you have any ideas on how this can be presented to them to get them to understand what we are doing for them and how much money they are actually saving, compared to how much we are losing, and get them to pay the full amount and at the same time keep the rest of their business.