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I was thinking of getting the 30 grot mob with 3 runtherders. Would this be a good idea?

If you want a big mob, go with 29 grots and 2 runtherders.

What do you want use the grots for?

I'd say try to get the least amount of runtherders as possible

19 grots and 1 herder or 29 grots and 2 herders

I agree with the other two posts, but don't forget that the runtherd has it's uses....