This would greatly help members who messed up with their training points (like me) and don't really wan't to spend the money to get them back. The primary example is with Pirate101. They have: If you're a normal member, you have to pay the crowns, but if you are a member, you could pay just a bunch a gold (raises depending on your level).
It really isn't necessary because you can just wait for the member benefit that is free training point buyback. That's what i did and it was really worth it. I bought crowns a few days before the benefit and was considering the buyback but decided to just wait for it and it all went in my favor. Ironically right after that benefit was the free tourney's, finally got my gorilla mount!