If you personally feel that you don't have the money, time, or energy to deal with his condition, then I think you have your answer. :P I don't think it's wrong, it's just how you feel. Don't feel bad...if you don't have the resources to deal with it and it would just make you unhappy, there's no reason to do it. If you don't want another horse with a medical issue, then there's no reason for you to have one. You don't want to buy him just because you feel bad and then end up regretting it. On the other hand, from what I've read, sweet itch can be managed, and people seem to like that Boett blanket--but what matters is how much you are willing to cope with it. You've already tried treating it and feel nothing is working, so you know better than I do how much effort it would be for you to have the horse. Just curious, why does it matter if it's hereditary, for breeding purposes?