Be upfront. Tell them its not supportable and negotiate what is. If they enjoy your service so much they'll be wise not to kill it through overuse, and it might

Be upfront. Tell them its not supportable and negotiate what is. If they enjoy your service so much they'll be wise not to kill it through overuse, and it might be that they have the means to make your needs seem less worrisome. If not, they're jerks, and you can feel better about changing the terms of the deal. Do the full Darth Vader routine on them. Act like you are AT&T.