I'm also a Mac Developer, my app is Codebug (http://codebugapp.com/) an Xdebug client for Mac. I created this app in 2012 while I was learning Objective-C/Cocoa, and it's been a very cool steady growing since day one.
Specially the increase your price part. I actually added a bunch of new features and increased the price. Guess what ? The sales didn't drop at all, matter of fact they increased. I get a lot more top-quality users and people who actually engage with the app and are prone to spread the word. Also, I'm selling it from my own website, not from App Store. Sorry Apple, I already pay you $99 dollars a year for your dev program. Not going to share 30% of my profits with you :P
iOS or Mobile app doesn't appeal me at all from an indie dev perspective. Everything pretty much has been done, and there's this stigma of not charging your app of what it's really worth. Everyone is doing Free, In-app or 0.99 cents apps. Screw that, I need to put food on the table.
TL;DR: Make a good product, keep improving it, price it right and you will succeed in the long run.