Plenty of power washing companies in the Disney area... some good, most bad. Knowing nothing about your residential market in NJ, I would guess that you are comparing apples to oranges. Low income neighborhoods surrounding Disney area and an abundance of overseas owners who are only in the home for 7 to 14 days each year, and are more focusd on short-term rental income - there is not the same desire to clean the roof or exterior walls. The main areas of concern to these absentee owners are driveways, front paths and pool deck and cage areas, as these are the areas most noticeable to those on vacation.
Good luck if you decide to wash in the winter months down here... Spring is when most of the calls come in though.