The question is what other factors give bonus worshippers. As I said, having many allies doesn't automatically give you proportional boost in worshippers. Either the allied worshipper is capped, or works on a diminishing return, or it doesn't give any bonus at all.
Forming a tribe, on the other hand, provides more visitors for sure. But I wonder if the increase quantity is per-clan or dependant on other variables.
Another possiblity is neighbour relation... Can't quite confirm this, though.
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