This is it - would a user pay a "delete all your messages just this once for $1" fee, or would lump sum work instead? I'm also wondering about maybe selling cr

This is it - would a user pay a "delete all your messages just this once for $1" fee, or would lump sum work instead? I'm also wondering about maybe selling credits instead - e.g. buy 20 deletes for $9.99. My fear with credits is that it would make the tool too complex. But again - I can only try :)