Chemdry get work from the full spectrum of marketing A - D's you will find them in Council housing schemes as well as the more up market estates.
Why?
?
Because they've established a Brand and created an Image as a result they can ask for Premium prices and get them. No idea what their conversion rate is but I'd guess about 30%.
Can you emulate them.............no chance unless you have a massive marketing budget.
Why bother ! Your running costs should be less than half of theirs so you could be charging half their prices and get a lot more work. If you're a competent operator you will also be a lot quicker on the job so you will be / should be more profitable.
Decide on your main market sector, the system you intend using and learn about marketing focus on your plan, use your customers to develop your business.