To be precise about Concorde's withdrawal from service:
Concorde used tremendous amounts of costly fuel even at the time of the Paris crash. On the other hand, Concorde was a flagship product (think marketing) for British Airways and Air France. Analysis showed the marketing benefit outweighed the losses per flight, so the operators and manufacturer fixed the problem and put Concorde back into the air. In other words, "commercial considerations" kept Concorde flying.
Several years later, though, a different problem cropped up. The airframes were reaching the end of their certified number of cycles. In order to keep flying, the manufacturer would have had to re-certify for a longer life. That would have been extremely costly, and the costs of any required remediation were unknown. With less than a dozen airframes in service, the decision was made to end the project. This time around, "commercial considerations" let the Concorde expire at the end of its design life.
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