For the wealthy, placement on the basic class hierarchy and open parasitism (i.e. unearne income) matter far more than "earned" income.
Most wealthy people have actual jobs/careers, Snowstalker (unless you think the likes of Mitt Romney or the Forbest 400 are representative of most people).
They nonetheless live primarily off what is produced by the labor of others.
So do cashiers at McDonald's.
Their position is necessary for their own survival and not exploitative, however. Parasites have power.
Except that you're claiming that those "parasites" are parasitic because they consume goods produced with the labor of others. By the logic you've put forth in this thread, everyone who isn't a subsistence farmer or a hunter-gatherer is a parasite.