My point was really exactly what you said in your last paragraph. I'm not convinced that there is an international trade in these films. Those that exist seem to be made for the personal use of the murderer(s).
The article about Natalie Holloway mentioned "the snuff trade" and it is that "for-profit" aspect of this terrible practice that I believe to be an urban legend.
I don’t know how much credibility to give this report. We know the sex trade exists but adding the trade in snuff films is a bit sensational.
Until a real snuff film is found for sale from a group engaged in the sex trade, I’ll be skeptical about any report that claims someone is engaged in such practices.