I'd bet that I'm a lot more cautious buying apps from the Mac App Store than I am from Google's Play Store, simply because Google's got that safety net of "Eh, this app isn't as good as it looked in the screenshots. I'll just return it." Trial periods also usually go a long way in convincing me to spend money on an app, especially things more costly than a dollar or two. A few months ago, I found myself debating between Totalfinder and Pathfinder- luckily, they both had a few weeks of free trials and I was able to determine that while pathfinder looked like it had more features, Totalfinder just felt a lot more seamless in day-to-day use. If I hadn't had the ability to sit down and get a feel for the apps, I'd probably have just said "fuck it, I don't need tabs and split panes that much anyways."