The high ranking leadership is mostly made up of the bourgeoisie and the petite bourgeoisie. Most of the higher ranking leaders come from the original settlers who colonized Utah, and therefore have that generational wealth from families who run industries in Utah (think the Romneys and Huntsmans). At the ward level (wards are parishes in Mormon speak), the clergy is unpaid, but it's generally run by PMCs and small business tyrants who have the time and energy to do it for free. Mormons believe in Prosperity Doctrine, so the guy who has a successful used car dealership is obviously the best pick to be the bishop.