I've got a theory about what's happening here. I reckon Team Eubank and ITV have struck a deal here where he's on a low purse with a big cut of the PPV takings. Eubank Sr. has gone on about what a PPV star his boy is, so ITV have said "Fine , if he is that big a draw, take the risk and have the thick end of the PPV wedge."
Therefore ITV's risk is minimal. So what they have then done is put together a pretty decent undercard which they are showing free to air on ITV4. The Eubank thing has garnered interest, but people won't pay for that , but watch the ITV4 part.
ITV wouldn't need to sell it that much because they don't give a fuck what happens about the PPV element. They'll ride on the back of the Eubank train and get the exposure and then get a decent audience for the undercard , gently introducing themselves back into the mix.
as for the lack of advertising, that's down to this Poxon Promotions and "Motion in Unity" , whoever they are. Eubank Sr. has probably got these guys on the cheap, and the old "pay peanuts, get monkeys" syndrome kicks in .
nothing else makes sense to me, and if this is the case , it's a ridiculously big gamble by Sr. which will definitely backfire.