Yeah, I imagine having to choose between two former classmates, who are probably long-term buddies, can be demotivating. Even worse than the usual knowledge that most American presidents actually come from only a few "royal" families.

Voting for Trump or Sanders is another way to express "I want someone who does not belong to the old aristocracy". The way the system is designed, if you don't vote, it doesn't matter; if you vote for a third party, unless you succeed to coordinate half of the population (rather difficult, if the media will push in the opposite direction), it still doesn't matter... so the only way you are realistically allowed to rebel is to vote for the most eccentric candidate in the primaries.