Hi Shaun,
This is an interesting problem to solve. I would put "heavy use" customers on their own search head and charge them for that extra hardware. While the searches also impact the indexing tier, it is going to be extremely difficult to charge for that. Depending on the size of your implementation, that incremental cost might not be noticed if it were distributed throughout the company. I'm not trying to promote bad behavior, just trying to determine the feasibility of chasing down the small stuff.
Jim
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