I need some info on the church's greed leading to the crusades,

The initial motive was to try and reunite the Orthodox and Catholic church, it was thought the crusade would retake Anatolia and the Romans would mend the schism so they could assume suzerain over the Catholic crusaders there, however as the campaign progressed they had great difficulty squaring off against the formidable Turks and gravitated towards the lucrative ports of the Eastern Mediterranean instead where they could be supplied by sea and march ever closer to the Holy Land.