iPhone app sales

At this point, I have 15 iPhone (and 1 iPad) apps available in the App
Store. Sales have been fairly steady since January. The beginning of
the year was great, in fact, due to being mentioned in Bon Appetit
magazine, having a Staff Favorite app, and, presumably, a greater
abundance of iPhone OS devices after Christmas.

I have free apps, educational apps, games, kids apps, business,
finance, and health and fitness apps. A diversified portfolio.

The weekly sales follow a pattern: Sunday and Monday are the best
sales days. Tuesday through Thursday see steady declines. Friday and
Saturday are the worst.

Last Friday, for reasons I can't explain (ie, no holidays, etc), was
about 35% lower than I expected. I was anxious to see how Saturday
would fare. Luckily, Saturday was a bit higher than usual, so it
served to offset the bad Friday.

One reason I like having more than a handful of apps is protection
against big sales swings. When I had five apps I would regularly see
40-70% variations in my sales figures. Sometimes a user would post a
scathing review--usually due to not reading the app description--and
scare off potential buyers. The app developer has little recourse
(oddly I get my most complimentary "reviews" through customer emails,
but only I see those).