What I got from this blog post is that they made an uninformed decision, and ended up with an unexpected result that pissed them off from the perspective of "lost sales". The email from Amazon clarified there were no money to made and sure enough, no money was made. The added costs of the server is unfortunate and justifiably something to be upset about (especially if you weren't accounting for it), but I have to poi…
Note: Sales did not pick up after the free app sale. Therefore that free app sale was actually a waste of time. Furthermore their app requires a server to run, since its not a subscription-based app the server is 100% on their backs. They now support 100,000 unpaid customers with a server, and ALL those customers are going to cost them in the long run.
Amazon further moved by reducing the price of the app for 3 days without consent and modified description of the app.
TL;DR = sales on amazon are for profits of amazon only, get their numbers up but provide no real value for clients. They developer makes more money selling 10 apps a week than having the promotion which permanently harmed their revenue.