Whether this decision was made because of bad advice, misunderstanding, or simple greed, the Conservative Party can't afford to have this story continue to fester in the media.
The party warchest is healthy enough to return $2 million, as a gesture of good faith and demonstration that the party believes in its own fight against even the appearance of impropriety in political fundraising.
And make it clear that in future, a ticket to the convention is not a contribution to the party. In big bold letters on the front, if necessary.