In most places, probably the fact that the local fiat currency is vastly more likely to be treated as real currency by the counterparties you need to deal with in real transactions; bitcoin has some direct acceptance, and a some additional reach from entities that have arrangement with other parties who will exchange it into more widely accepted currency for them.

> There's nothing fake about Bitcoin.

Bitcoin is a real thing, sure, that's clear. Whether it is real money -- and particularly whether it is something that effectively performs the medium of exchange function of money in common circumstances for which people need that function performed -- is a little less obviously true.

The original question is fundamentally similar than asking if you'd like to be paid in gold bars, grain futures, stock certificates, or live cattle. Would you want your salary to be given to you in a volatile commodity that you would be responsible for converting to currency?

If you really really really want some bitcoin, it would be more prudent to get paid in currency and then immediately convert some portion of it to bitcoin.