So, this self-publishing service has started advertising on a Facebook thread.
Their cheapest "self-publishing package" is 299 GBP, but they DO offer a video marketing package for the low low cost of 99 GBP.
So, paying someone else who calls themselves the Publisher in their Publishing agreement seems to me to defeat the point of self-publishing.
Here is their Publishing Agreement: https://drive.google.com/file/d/0B7e...ZuTnJnRFk/edit
I'm not seeing a scam here so much as an unnecessary service.