Any offer for a buyout, if there is one, has to be reviewed for adequacy and fairness by the Board in view of the company's assets and future potential; and not on the basis of a Director's average cost. The Directors have a fudiciary duty towoards all shareholders, including little guys (and gals) like us. The Board then makes its recommendations to the shareholders.
There's just too much at stake, including their own reputations and legal liabilities, for the Directors to be seen to favour a particular shareholder. The decision is made by the Board, and each Director has one vote, regardless of how many shares they have. So the % ownership of a shareholder should not come into the picture, at least in theory.
I don't think the average cost should be a big concern; the buyout price should be based on what CUU has and not the average share price of a shareholder. JMO