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Josh K.In some respects you are right - you can accept or reject discover if you chose - however, if you agree to accept it, I do not believe it is your right to place conditions on the acceptance that violate your agreement with discover. If you do violate that contractual agreement, you will likely be subject to having your right to accept discover revoked - and who knows, there may even be some form of liquidated damages provision for a breach.
Also, as a seller, you dont simply have the right to refuse payment of a legal tender as you see fit - I guarantee you that the first time you refuse a credit card that you have contractually agreed to accept and the person you are refusing is in a protected class (a legal term us employment lawyers use) you will be faced with a discrimination lawsuit.