BuddyPress Charges allows you to charge points from your BuddyPress users for certain actions such as sending private messages, joining groups, and viewing other users’ profiles. Simple & Easy-to-use – Your users will be charged and credited in myCred points.

Buy or Sell Profile Access
Allow your users to buy and sell access to their profile for myCred points.

Messaging
Charge or credit your users' myCred points every time they send or reply to a private message.

This addon requires the free myCred core plugin found here.