[sakura-panda]

I don't think the first part of a book is a reliable sample of whether or not a book is going to hold my interest. I like to flip through and read a section about halfway through, maybe a little more or a little less, depending on how big the book is. (It's hard to to this with ebooks that insist on only showing the first part of a book. Amazon's "look inside" for print books is more random and I use that whenever it is available.)

That said, this sounds a lot like what I do when I'm looking for my next book to read, where I'm in the bookstore or the library and I read a random sample of some book and I think it sounds like a neat idea. I would sign up for it, as long as I could read any part of the book that I wanted and was not limited to the beginning.

Like everyone else, I have a large TBR list, but my tastes change, and I wouldn't pass up the opportunity to discover a book I might enjoy now for the sake of a book that I chose in the past.

It sounds like you want to apply this principle to the books already in your TBR; but the difference (to me) is that even if you reject the TBR books, it doesn't make sense to get rid of them completely because preferences change, and a book you didn't care for today might be one you can't get enough of in a few months. I couldn't do it, because I would want to read something in the middle and that's awkward with ebooks.