@Aegis: Nice to see you too, sweetheart

I don't like the idea of buying false diplomas either, for several reasons. Since it doesn't exist here, I have experience of the risks, so this is just speculation, but:
1. Obviously, selling such diplomas is a way of earning money by fooling people, which of course I dislike. However, this is not a more (or less) serious problem than all marketing of non-working products in general.
2. Lazarus describes that in various professions where it would matter, you wouldn't get very far with a fake diploma unless you know enough to keep up the appearance, in which case it doesn't matter if you hold a diploma or not. However, isn't it possible that a person might get a job and manage to screw something up before the fraud is discovered? I remember reading about a case long ago, where a dentist posed as a plastic surgeon and managed to perform a series of failed surgeries on patients, who only afterwards discovered they had got different health problems due to unprofessional surgery.
3. Perhaps you could use a fake diploma to pose as an expert to non-experts, and use this to sell in a message? For instance, I've noticed that the creationism movement in the US often have spokesmen/women with PhD:s from diploma mill universities. To a layman, it might feel reassuring and safe that a person is a PhD in biology, and the layman won't notice that the spokesman speaks total BS and therefore be easily gullible.
@Lazarus: So, do you think anyone could have any real use for a fake diploma?
@Kid: The diplomas you can buy from well known uni:s, are they forgeries, or are the universities participating in the business?
@Mr Flibble: This is the first mail of its kind I receive. I realise they send them en masse and have no idea who I am, but I found it a bit ironic that they sent it to me who is in the late phase of my PhD at a very well known uni. I'm really in a desperate need of a fake BSc
@Ysh: I'm not sure about other countries, but in Sweden it's more difficult to get a honorary doctorate than a real one since they are awared as you say for life time achievements. Only a few people every year are awared. A real diploma on the other hand, is accessible to anyone who feels like studying some years at uni.