The automotive and tech blogs are aflutter Saturday with news that Elon Musk has gobbled up another chunk of Tesla stock — this time at a discount.

Musk exercised and held a stock option this week that saw the multi-billionaire increase his ownership of Tesla Motors by 532,000 shares. In total, those shares are worth over $101 million as of the last closing price of $191.20/share.

Here’s where the discount comes in: Musk’s option dictated a price pegged to the share value as of Dec. 4, 2009, before the automaker went public, of $6.63/share — or just over $3.5 million.

Sounds like Elon got a stellar deal. But does any of it matter? Is owning 1/5th of Tesla a big deal?

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