I experience a similar issue. We work with a number of clients globally and turn up for work intheir timezones.
I've got it through to my parents now (how we work, not what we do as that's a totally different story) .
I explained to them that the alternative to hiring us (PM + Community/Content) is 2 full time members of staff, or expensive on-site contractors. We're a duo that aren't held within another 3 layers of leadership, travel costs, pension requirements etc.
We flex to provide worldwide coverage (one client today is in NZ, the other Peru and we have calls with each)
So it makes sense for some companies to employ us as we're more cost effective, we can flex in number of hours etc.
On top of that, this is the most suitable lifestyle for us as we can travel to wherever we want (within reason), do some work, and see the city