So how much did he spend on advertising? Why is he saying that all of his advertising only goes towards a single day of sales? Shouldn't it really be seen over a week after and week prior to get a good idea of the impact it had?
I've spent almost no time in the Mac App Store, when I want software I go to Google and when I want games I go to iTunes.
Developer tools can't be an easy market to succeed in. You aren't going to get many impulse buys.
His sales vs position has nothing to do with the appStore and everything to do with being in an extremely tiny niche market.