The ease of use of the App Store, compared to any store a developer can ‘roll themselves’, will soon become a competitive advantage for developers - the App Store almost entirely eliminates the barriers associated buying software. Sticking with our own store would not only make the purchase and registration of our apps a hassle, but each sale outside the Mac App Store obviously doesn’t count towards Apple’s chart positions.
iOS developers have long known that featured status or a high chart ranking typically send sales through the roof. With each sale via your own store not counting towards the rankings, we feel that selling apps away from the App Store ultimately compromises any App Store presence. Going App Store-only is a big leap of faith for developers - requiring them to place a significant amount of trust in Apple, which some might be wary of - however we think that over the next year or so more and more Mac developers will go App Store-exclusive.
Realmac Blog - Mac App Store Sales Figures
A great summary of why you’d want to publish your software on the Mac App Store.
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