Unfortunately, most of the elders were blue collar workers, some who just barely graduated highschool. There were a couple of exceptions, but they all stepped down. It seems like the ones who like the power of being an elder are often powerless in the real world.
There were a couple of men from South Africa in different cong. I attended. These ones were very intelligent, but seemed to stay to themselves and not get involved in pushing ahead for "priveleges".
I think it probably has more to do with being a company man than it does intelligence or class, as far as promotions in the borg. go.