I have a paid app in the Play Store (Profile Widget, in case anyone is wondering ;)) and I want to allow some users (friends, or people who do not have a credit card) to dow
You can set up a sale at price zero for the paid app and let your contacts know about it. Google allows up to 8 days of the sale at a time, but you can also set it up for a single day. This way, you may still get a few downloads from unintended recipients, but the 'problem' will be far more controlled than if you were to mail out APKs. Other problems like updates are also solved automatically.