I think it's okay for them to have this policy but it would be a good idea to make it clear up front (notice on their site) so people don't waste time trying to place an order with them. I once had an inquiry from a potential customer who complained I wasn't growing chestnuts organically. I tried to explain why I didn't but he interrupted me and I told him to go grow his own. Fortunately, very few people try to tell me how to run my business other than to say I should grow more.
