There’s an emerging view among iOS developers that both the amount of work involved and value created by app development merit higher prices for apps. But a new study shows that developers test pricing tend to lower the price of their apps — or even charge nothing at all. New research published Thursday from mobile analytics firm Flurry, which looked at app pricing over the past four years for 350,000 apps using Flurry’s mobile analytics service, found that developers are charging less for their apps over time, and many times, end up going completely free. (The results are weighted to account for number of users for each app.) The result is more ad-laden apps. But Flurry says purchase habits show that user demand is higher for apps that will cost them nothing, even if there are ads as a result.