Minimum buys are introduced for many different reasons and are mostly for the buyers advantage. In many instances brands forecast their production in advance of the selling season to enable them to price their new season samples most commercially for their brand by negotiating fabric/component price and production price based on a minimum order put down with their own supplier and factories. To achieve the sample price a minimum must also be achieved and this may form part of minimum order needed from their buyers. This could be the same for delivery charges too. As there are several other reasons why a minimum may have been introduced please do talk to your brand and ask why it is there. In any challenging market partnership between brands and customers is key and clarity forms a large part of that relationship.