I remember looking at prices for Concorde on British Airways and saw the LHR to JFK was £4499, which works out to be £10,476 today.
Basically Concorde was a tube full of rich prats being flung across the Atlantic at high speed and nothing else. It was cramped and someone noisy. Tupolev built some Tu-144s which did the same job but worse.
Boeing had pre-orders for their 2707 but like the Lockheed L-2000, none were built.
Was it a good idea? Not really. It took British garagistas and French engineers and combined them into a flood of foolishness.
(edit: this is not the SST reflections the OP was looking for)