You're wrong. Celibacy was part of moral renewal of clergy rather than economic "investition".
The Cluniacs were also concerned that nicolaism (marriage of the clergy) would lead to subserviance of the clergy to the state, because a lot of times the clergy would marry a daughter of the King. Then the King would hold a lot of sway over the Church... of course during that period before 1100, the King was head of the Church anyway.
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