Explain why the Crusades are considered to be history's most successful failure?

The Crusades failed in their chief goal -the conquest of the Holy Land.

Explanation: They also left a bitter legacy of religious hatred behind them. They did have positive effects though by increasing trade and travel, encouraged the growth of a money economy, helped to increase the power of feudal monarchs and enthusiasm brought papal power to its greatest heights.

the Crusaders could not reclaim the holy land

Explanation:

in this scenario it would be the consumer demand as most influential in making the decision. the band members need to figure out where and from whom they will make the most money, in other words who out of the two consumer groups - football fans or car drivers - will spend their money, who is more likely to contribute to their cause and buy what they are offering.