By adding intuitive confirmation steps, we have done everything we can to limit accidental in-game purchases. When you try to purchase equipment or cards using credits, you will always be notified. It has worked very well to limit these situations.
Because Virtual Regatta is a real-time, online multiplayer game, reverting a change would impact your competitors negatively. Since it is impossible to roll the game back to a previous status, or remove features from a race in progress, refunding these credits would unbalance the game. We feel that it would be unfair to other skippers who have earned their progress on the race with their own credits or those offered to them as they played.