Yep, ten years is a long time - most famous Munchausen by Internet cases seem to culminate in death within a few years.
I guess it also depends how one is defining Munchausen by Internet. My understanding is that the term has been coined to describe a certain behaviour - that is, the behaviour of faking an illness online, which looks like the behaviour of people who display Munchausen Syndrome in 'real life'. But, when online, it is defined purely by exernal behaviour, not by intent or mental health.
Maybe harder to pin down, because you don't see the real person, and also because the lines between faking, fantasy role play and creative fiction can become blurred online. I find quite a few people see online people as 'imaginary people,' so they fake online in a way that they wouldn't with real life people, because they don't see the relationships as real, and they see the internet as a sort of realm of imaginary fantasy.