Why make a PAID app FREE for a day.
The #1 REASON to make a successful PAID app FREE for a day is to get free mass user testing. Even the most successful paid apps don’t get nearly enough downloads per day to generate sufficient ITunes Connect Crash Reports and it is nearly impossible to test your app on every possible combination of iOS hardware and iOS version. Sacrifice some revenues, get the downloads, get the ITC Crash Reports feedback and user support emails, fix the problems and go back to paid. That simple!