well, to be fair, he does already own a controlling interest of preferred stock... which is more of his stock than any other founder of any other tech company that is publicly traded owns.
Discussion
That’s a fair point, perhaps a better argument would be if you already owned MSTR & Bitcoin any extra funds should be put towards more bitcoin.
The bottom line is that while you get a short term premium over bitcoin by buying MSTR there is considerably more risk. Regulatory risk, execution risk, custodial risk.
For me any premium I might get from MSTR is far outweighed by owning a self-sovereign asset directly.