Here is an interesting blog post about how Ubuntu prices their apps. App developer Marcos Costales recently tried to upload his app to the Ubuntu Software Center, but when trying to set a simply low price, Ubuntu requires either $0.00 USD or at least $2.99 USD as a minimum price for a paid app.
What do you think about this? Should Ubuntu offer apps for under the $2.99 price? As a prime example, both the Android Play Store and Apples iTunes Store offer low priced apps... many for an easy price of $1 USD. There would be a lot more purchases of apps in the one dollar range then say an app for $25. If you support the idea of lower priced apps in the Ubuntu Software Center, consider creating a bug report!