Two thoughts, one direct and one indirect. First, let me tell you in my experience at least, raising prices on customers often angers them. It's OK to do it indirectly, by adding more seats / users -- no problem. Or upgrading to a site license. But just asking someone paying $10k a year to pay $20k the next year for the same product = anger. In my experience at least. You turn your advocates into prisoners. Don't do that. You'll lose all the second-order revenues and elective upgrade opportunities. Not worth it.
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