All ya gotta do is tithe. 10 families (a "minyan" if you will) giving 10% each, makes 1 average family income, sufficient to support a comparably fertile family at a comparable standard of living. Anything beyond 10 is just icing on the cake.
Beside, the demographic demise of the West is such that SOMEBODY's gotta breed.... maybe we can't afford celibacy any more? Priests having 12 kids each might be the best thing that could happen.
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That's the best argument I've heard yet supporting the marriage of Priests.