Why did the merchants go on crusades?

Merchants participated in the Crusades primarily to expand trade routes and gain access to lucrative markets in the East. They sought to establish direct trade relationships with regions like the Middle East and Asia, which were rich in spices, textiles, and other valuable goods. Additionally, participating in the Crusades offered opportunities for wealth accumulation and the potential for increased political influence, as well as a chance to spread Christianity and secure safe passage for their goods.