Tim Cook opts out of $75M worth of company dividends

Cook has changed the culture at Apple since taking over the helm and his employees are giving him high marks. So when this popular and high earning CEO opts out of $75 M worth of company dividends - you immediately think - how amazing of him.
But why? Has Cook determined that he has been compensated enough? Or is this simply a tax play as was suggested by Tim Worstall @ Forbes.com.

"At Mr. Cook's request, none of his restricted stock units will participate in dividend equivalents," the company said in the filing, which was flagged by MacRumors. "Assuming a quarterly dividend of $2.65 per share over the vesting periods of his 1.125 million outstanding restricted stock units, Mr. Cook will forego approximately $75 million in dividend equivalent value."