Why guests don't answer messages?
I may have some insight on this.
Having recently booked a short break via BDC and making the mistake of checking a couple of competitors while logged in, I have since been bombarded with promotional emails, between 10 and 20 to date, in a space of 2 weeks!
That's totally OTT and unjustified. I can see most people, as I have, simply deleting without reading or just ignoring this mass attack.
Very counter productive in my opinion.