Does Size Matter? --In Books?

I've been seeing a trend in the writing-reading world. A trend toward shorter books. Mostly novella length things that run between 20,000-35,000 words. I suppose some readers like them because they're usually less money to purchase and can be read in about an hour and a half instead of the all day marathon most of my books demand. I'd love to know what you think so please leave a comment to this post if you have time. I've highlighted the questions I'd like you to ponder on as you read this blog. I have written several shorter works. My latest is Have Wand Will Travel a Magic and Mayhem Kindle World novella of 35,324 words. But I have to tell you writing short is difficult for me. I've posted the word count for all my shorter pieces below. To Capture A Highlander's Heart: The Beginning is 3,064 Caught In The Act is 3,331 An Automated Death is 14,099 To Capture A Highlander's Heart: The Courtship is 19,958 Breaking Ties (A SEAL Team He...