My personal opinion is that if you are going to send him the account file, you have to know how to export it yourself already. Meaning you could very easily just email it to yourself and let it sit on an email server. You could copy it to a thumb drive, disc, etc etc etc.
Is his service worth the cost in my eyes? No. Others might think it is worth it. Nor his he trying to steal accounts from what I know of him. He is simply trying to help others in exchange for a very small sum of in game credits. Kudos I say.