In a limited market there is decent money to be made IF you've the skill required along with the tools. Ask yourself, why should a hairdresser get upwards of £70 an hour, yet we are grateful for £20?!
I tiled a wetroom in 2 x 12hr days and the customer complained I was too expensive versus the time it took.
Quite simply said (what I learnt on this forum) do you want to pay for the years of blood sweat and tears it took to be able to work so fast and to that standard?
Never be afraid to ask for decent money, but be prepared to 1) justify it and 2) deliver what's promised.
When it comes to large format pricing, on tricky domestic jobs, factor in :
Access problems, area to set up tools, time spent making templates, who is responsible for spares and breakages, time constraints, tools you may need but haven't got. I always factor in a day to set up tables and tools and a day just to stand around drinking coffee and planning the job.
If anyone questions your prices, invite them to get other quotes, be sure to point out the specialist skills, tools and experience required to install such expensive tiles.
Any customer worth working for will see sense, any customer who is just looking for a cheapest quote isn't worth working for in my opinion and deserves what they get.