I think most or all of us agree that you are not owed that egg. It was your responsibility to know about eggs before you sold the snake, but I still think that this thread is warranted so we can be prepared for the nickle and diming that will likely come with future transactions. Being on the selling end of this hobby for one year has turned me from a happy pushover to a somewhat jaded skeptic when it comes to dealing with potential buyers. I guess it just comes with the hobby, and although I've never been ripped off outright, I wish I could have had some warning about certain people a year ago. I don't think this experience is a very unique case, so my advice is to expect a lot more of this kind of thing, and toughen up now. It's a shame.

Thanks for the warning, and if you decide not to make these issues public in the future, feel free to pm me with people who might be more trouble to deal with than it's worth. I'd be happy to do the same.