Hi Alan:

Sometimes I like booking through a host but sometimes when I don't have a host relationship at the location, I DIY on the website to utilize an offer.

I agree it is odd that you cannot book on the website as it saves CET money, time and (perhaps) the host commission.

After I return from a trip I receive a Questionaire from CET asking, among other things, whether I like to book on the website or through a host. Maybe you once informed CET that you only want to book through a host and that is why you only have that option.