The Sunk Costs Fallacy

Have you guys heard about this?

My cousin posted the below video on his FB page:

Um, wow! That's what I'm struggling with right now.  I am, according to my Kindle, 19% and 12% of the way through The Irresistible Blueberry Bakeshop and These Is My Words respectively.

I don't like either of them.  

It is just not happening.  I'm tired of trying to read these books and I have SOOOO MMAAANNNYY books, ten on my Kindle alone, that I am anxiously waiting to read.  It's actually making me cranky.   

I've sunk weeks into trying to plow through them thinking "maybe it will pick up in the next chapter!", "It had good reviews!", "Maybe I'm missing something here?"  Dagnabbit, I want these books to be good and worth my time/money.

Anyway, I think for the first time ever, I am going to give up on a book, or in this case books, and walk away.  I am going to call it a day and admit that just because I have sunk time and money into these books they aren't worth it any longer.  Especially since I have so many others that I am chomping at the bit to get to! (You can't tell that I am trying to make a case for myself, can you?)

Has this ever happened to you? Have you had to give up on something even though you've sunk your valuable resources into it?