Even if you are not earning $750,000 and you are not rich enough to put all your salary into investment yet, accepting bitcoin for your salary sounds a good deal. Some people are worried about the fluctuations in the market but as long as the employer gives you the equivalent amount of btc in usd, I think there should be no problems, am I not right? The good thing is if you are planning to put your salary in bitcoin to invest, you do not need to convert it into bitcoin since it was given to you in bitcoin already.
Well no, in my case I wouldn't do it because I earn much less than him, and just as you mention with a drawback that if you get paid in fiat you have to convert fiat to bitcoin to acquire it, in the same way I have almost no options to spend bitcoin directly, so I would also have to convert bitcoin to fiat for my daily expenses. Besides, I would not like to see a 10% drop as soon as I get my salary, which could also be the other way round. But I prefer the way I am, I get paid in fiat and then I'll take it from there.