Why do I keep reading these books?

I guess I might be getting to a point where I am confusing the Booklikes Database. By putting in all of the Xanth books the algorithm is probably starting to think that I read a lot of pre-teen fantasy novels. While it is true that I have done so in the past, it is not necessarily something that I am doing at the moment. Okay, I do have a number of such books on my self which I will get around to reading someday (which includes Game of Thrones, but that is hardly a pre-teen fantasy novel).
I guess the other thing is that I keep on giving the Xanth novels one to two stars, which suggests that I did not like them, yet I am writing up comments on the thirteen that I have read, so I suspect that this suggests that I may be some sort of sucker for punishment. Most normal people who give such books such low scores are unlikely to continue reading the series. Don't get me wrong, when I was reading the Xanth novels I did enjoy them, but as times have changed, and I have expanded my reading scope, my interest in pre-teen fantasy has diminished.
Anyway, this book is slightly different. It stars Ivy, the hero of the previous book, and it is set entirely in Castle Roogna. She is talking to a ghost and wanting to know his story, and she uses the magic tapestry to actually watch the story unfold, in much the same way that we watch television. Now, there is mention of the Adult Conspiracy in this book, and while this rings a bell, it is not clear as to what it is - yet. People have suggested that there are further hints as to where he is going with the series, and it is interesting how he does it. Anthony really likes using puns, and this is something that is constant throughout the series. However, there does get to a point where we simply stop reading the series because it has stalled and our interests are directed elsewhere. Unfortunately for me, it wasn't with this book.