Will the middle class and poor have a say in the richest cabinet in U.S. history? Can the $4 Billion cabinet relate to the average citizen?

Different only in degree from the past. Give an example of someone pulled from the 'common' people to be a cabinet member in past administrations. The only bitch is that Trump did not pull his cabinet together from the feeding trough of permanent government sycophants.

Wasn't the election having a say?

They're all businessmen/women of one sort or another. Therefore, they absolutely relate to the economy, and fixing that will have greater effect on the average citizen than nearly anything else they do.