Domestic work has it's drawbacks, dog poo, stroppy customers etc.
Here are some of the drawbacks of commercial work.
Contracts are not forever. I had a department store cut it's work by £700 a month last december.
Every man and his dog wants the work, and comm. jobs have no loyalty to you, it's all on cost. So you can be undercut easily
You always wait for the money, 2 months frequently. So if you employ you have to pay them first and then yourself.
More agro in general and cos it's a big contract it's hard to walk away, so you have to take it on the chin.
More regulated, Health & Safety etc.
I quoted for some Argos stores recently, 35 of them. I didn't get the job they wanted to pay £7 a store in & out once a week.
I would agree that a good mix of both is best. Do some commercial work early a.m. then a few houses. But DON'T rely on it as I started to.
During this recession the gap in hourly rates between houses and commercial work has narrowed.
Lecture over, sorry