not sure i agree with that ds for a start if you had a big contract with council you would still have your normal work so would probably employ some one to help, then if you lost the contract you would have to lose your employee but you hopefully wouldnt go bust, remember business is about taking calculated risks, for example on this forum one company could make it very big ie m-clean, he only has two clients but if he had not taken the risk he would probably be sitting at home scraping a living, but instead he has a chance to really make some good money and grow his business.
My personal opinion is that there are vast opportunites in pressure cleaning, it is still a reletivley untapped market but we all need to get past relying on the domestic trade and just plug away to get the commercial contracts, make them the bread and butter of your business and treat domestics as a nice bonus