The Dilbert guy wrote a thing a few weeks ago about his former job at the front desk of a hotel: 
During my college years, I worked two summers as a desk clerk for a resort in the Catskills. That's where my boss taught me that one of the services we offered was listening to irrational whining. He explained that certain customers enjoy complaining. To them, it's not so much about getting a solution to the problem as it is the complaining itself. The resort catered to people's vacation needs, and if complaining was what they needed, it was our job at the front desk to listen to it.
I witnessed a strikingly similar event as I checked out of a hotel recently.  The hotel was a popular vacation spot in a warm, sunny area.  However, it was March, so the average daily temperature didn't far exceed 80°F and the nighttime temperature hovered around 55°F.  As I was signing the receipt and checking out, a woman approached the front desk (keep in mind this was around 8am).  Below is a transcription of the entire conversation, beginning to end, that the woman purposefully woke up early that morning to complete: 
Woman:  "I've been to this hotel before and the pool wasn't always this cold." 
Ok, so maybe the hotel clerk said something in response.  I didn't quite notice it.  I was too enthralled by this complaining woman.  I signed my receipt and left, so maybe a lengthy, detailed discussion ensued.  But in all likelihood, the complaining woman got up that morning, took a shower, got dressed, walked to the front desk, and voiced her complaint ... for the sole purpose of complaining. #business