Dear Mr. Sparkle,
A well-informed poster answered this quite well. His response was:
Peter has addressed this question recently, you can find his answer in the video below at the 51:50 mark. https://m.youtube.com/watch?v=PKBOqIcMQlg
I may like to add that I have about 1,200,000 stock options expiring in November which will cost me (after cost of buying and taxes) close to $1MM… so what I typically do is sell some shares to cover those costs… at the end of the day I have increased the number of shares I own….
…good enough reason for you? ;-)
Hope that Helps,
Peter