I was looking over the requirements and the one that caught my eye is that you have to live there for a year. Who has that kind of time except retired or unemployed?
And a year commitment would likely mean a year's worth of exposure. Granted, however, aside from government workers, college students or the chronically unemployed, those seeking to hitch their wagon to a realty tv star are in the minority. The retired generally aren't stupid enough to go on these shows (and are almost always wiped out in the screening process.)
It does raise a question, however... If a reality program actually did their casting via a lottery system (and thus got real people..) how long after would the gay mafia protest that the system was obviously biased since they didn't get any gays on the program?