Drastic drop of e-book sales at Ellora after Amazon changed its search algorithm

From Publishers Weekly:

Ellora’s Cave CEO Patty Marks confirmed the house is downsizing in the wake of what she described as “drastic’ and unexplained declines in its e-book sales via Amazon. Marks confirmed the layoffs of freelance editors, and said the house continues to have discussion with Amazon to find the cause of the sales dropoff. 

Marks sent a letter to Ellora’s Cave authors about the major sales dip, and the note was then re-posted online. Marks said Ellora's Cave sales via Amazon have dropped by as much as 75%. "We’re talking to Amazon and trying to figure out why this is happening,” Marks explained, noting that Amazon is the biggest sales channel for the digital-first erotic-romance publisher. 

According to Marks, the issue is likely related to a change in Amazon’s search algorithm. Many of Ellora’s Cave’s bestselling authors and titles simply don’t show up in the Amazon search engine anymore. She pointed to one of the house's most popular authors, Laurane Donner, whose books are New York Times bestellers, noting that a search for her titles on Amazon initially retrieves only free giveaways.

File this under "risk of depending on one single customer which is so much bigger than you".