there was no money to be made in the crusades, it was waged purely for religious reasons. As foreign as it sounds to us, the crusaders truely believed in god and redemption
all those caravans, sugar, paper, spices
look at that caravan there. full of gold and silver, commodities.... must... resist....... company, CHAAAAAAARGE!!!! FOR MON... err... FOR CHRIST!!!!
as in any war people fight for different reasons. money, glory, beliefs, life, freedom, slaves, sex....