What is "profiteered"

Usage examples of "profiteered".

In the final analysis, it was not Kreuger who profiteered on the ruin of the investors he had swindled.

Finally, during the Crusades, the Italian cities had become the point of embarkation for the Crusaders and had profiteered to an almost unbelievable extent.

Perhaps we profiteered a bit, but show me the merchant who operates at a loss.