We’ve been so spoiled by triple and quadruple jumps in e-book sales that when there’s a dip we wring our hands and wonder if the long-dreaded Topping Out has arrived.

A few of us felt a chill wind the other day when the monthly statistics furnished by the American Association of Publishers and he International Digital Publishing Forum reported that sales in the second quarter of 2010 showed a light decline to $88.7 million from the $91 million reported by the industry in the previous quarter. See E-Sales Soften – if You Call Double “Soft”

Given the fact that Q2-10 sales were twice those of the prior year, most analysts felt it was nothing to get hung about.  But we were curious and asked a few knowledgeable professionals if they could shed light on this small reversal.

One said he thought that the kicking-in of the agency model, which broke e-book prices out of the $9.99 list price ceiling that Amazon had tried to establish, had something to do with it. (See Apple Promoting a New (and Radical!) Model for Selling E-Books?). Consumers just rebelled against paying $12 to $14 or more for e-books.  This view was supported by this comment posted on our website: “Second quarter is when I started feeling the sting of agency pricing for e-books, and I cut way back on my e-book buying. I imagine a few other folks did, too.” (Thanks Stacy!)

The so-called Big Five publishers that switched to the agency model not only took a hit in sales but took in less revenue per e-book sold. Plus many independent e-book retailers did not and in some cases still do not have signed agreements to sell some of the most popular titles.

Another observer reminded us that a huge number of people bought e-book reading devices or received them as gifts for the Christmas holiday in 2009, and that led to their purchasing tons of e-books in January 2010, still the biggest month in e-book history. In subsequent months there was no place to go but soft.

Okay, so a cloud darkened the sky momentarily.  But one glance at the charts reassures us that the prediction for years to come is sunny with a chance of a sprinkles here and there.

Richard Curtis