Unless they have a billion dollars! It was their money that built the arcs, remember? Imagine the irony. Poor/working class people building the arcs for money not knowing that they will soon be dead and unable to spend the money they are making. The rich simply wrote a check and sail away to safety. That part of the script was no fiction; I can totally see that happening in the real world.
I don't see it making a difference (maybe to some hick gas station attendant) anyone with reasonable intellect realizes once civilization falls money will be good for toilet paper since it will have no monetary value other then the '20' printed on the bill, the real treasures will be as they were in the past raw resources or valuables that can be utilized (ie. petrol, knives, cutlery, flashlights, batteries, etc.)
So all in all the rich will be utterly useless, unless they have degrees in engineering, architecture, etc.