It's the unknown, I've been there several times and currently own a service business, with 20 employees, which can be great, most of the time, but can be hell, much of the time.
In this industry, I suggest the best way to go, is to set yourself a target, either three, or five years ahead, when, provided that you earn enough, you will have built a saleable asset and reinvested your profits to either, increase your business, or prepare for something else.
You are either cleaning carpets " for a job " or " to build a business " which can be sold.
It does'nt matter which, as long as you are happy in what you are doing, bearing in mind that everyone has different ambitions and desires.
Often, it can be more profitable to run a more compact set up with strict cost control than a bigger operation with uncontrolled costs, where you one day realise, you are running a business " to keep other people in work, pay their mortgages, run their cars, etc "and getting virtually no return .
This is more common than most realise and while it's very noble to provide work for others, it might not be profitable.