Larger commercial work is a completely different ball game, rates are a lot lower.
But then some of my lads I've took on for a months works and they've been with me for 5 years, pretty much solid. And.......... they don't have to have insurance, they get paid fortnightly, they don't have to go out and price work or chase it, no chasing of payments, tax deductions are done for them, and most importantly its not them taking any commercial risk its me so if a job goes wrong they don't have to worry about it.
I think a lot of the posts here are from guys having to do a lot of this for themselves, and like has been said in this thread "what is your time worth?" as with most things its worth what someone will pay for it.
Peace of mind that you've got steady work can be worth its weight in gold if you don't like the hassle of chasing other people.
As a rule of thumb our day rates aren't far off the rates in other posts, but we like to work on fixing 10 m2 per day minimum, so if your charging £200 rate should be £20, labour only of course. But then this would be for just turning up and fixing.
The available m2 on a commercial job are completely different to doing a domestic bathroom (We currently have a 3000m2 job running for 7 months and a 1800m2 job for 6 months), and I've known a lot of fixers over 30 years in the business that get excited by the rates in the domestic market. But when a plumber or other trade (or customer) hasn't got the job ready and they have an abortive day, domestic don't get paid, but commercial guys do.
It can be horses for courses, and what one person will prefer another won't but don't get put off by the lower rates in the commercial sector. There are other benefits to lower rates.