And despite the trappings of luxury, that money bought you speed but no real comfort. The seats were narrow, the aisle was narrow, you were relieved of coats and other encumberances because there was no room in the cabin for them. There were fewer catering options than 1st class owing to space limitations. The extinguishing and relighting of the afterburners as part of noise control procedures was rather disconcerting for infrequent travellers, as was the temperature of the inner skin of the aircraft. And you had to sit next to the incurably self-important.
I've only flown Concord by accident (when the 747 service was cancelled) and while it was a novel experience, the plane was a technical curiosity rather than a practical form of transport - and well past its sell-by date by the time it was taken out of service.