Why stop at mentioning their books? Why not go the whole hog and have all of them mention ALL the other money-making ventures they're involved in - TV/singing/contract work/whatever? Then we'd all be paying for them to further their money-making ventures right across the board and there wouldn't be much time left for them to rabbit on about what the gallery are telling them to say and there may not even be enough time to demonstrate all the items. In fact, we could just have a channel where the object is to sell the quality and value of presenters' careers - at their convenience. But how many of us would still be watching, I wonder?
It's totally unprofessional and not what I, a customer, expect my money to be spent on.
