1. The user doesn't get notified that they have been sent a question and the person that asked the question doesnt get notified that its been answered.
and
2. The ask button doesnt appear on users profiles, it appears on the user hints plugin but not on there profiles like your screen shots
Our site is kikcommunity.com if you want to take a look
Its a good plugin, I think with the added notifications and the ask button fixed on users profiles then its worth $30 but as it stands it doesnt feel quite complete yet