I think that without knowing the y-axis of that chart it's hard to judge whether it's really not worth it to even be listed.

Mac apps are more niche than their mobile counterparts. Why is a discussion for a different time, but _selling_ niche products is very different than freemium or even paid mobile apps.

If sales are low on a daily basis I'd say the downloads came from users who knew what they wanted and just needed a way to get it, which is what I suspect is happening.

I'm not trying to defend the Mac App Store here, obviously it leaves a lot to be desired as it related to discovery. I'm not sure if we can blame Apple for that or not though. Desktop app stores never really took off with steam being the only exception. And steam isn't for apps.

The only real advantage I see the MAS could have is credibility when it gets to subscriptions. Let's see how Apple will handle that.