[Yahto]

I don't think I'd blame the Crusades solely on a desire for wealth. There were a multitude for reasons for all involved over the span of several centuries that they occurred. I find it difficult to blame something on such a massive scale on a single word when hundreds of thousands of people were all involved with their own motives.

You really need to think about what the initial justification rather than the motivation of the majority of the participants sometimes.