It's generally understood flow hives lower the barrier to entry, but prevent economy of scale.
But where, exactly, is the tipping point?
Let's create a simulation in excel to answer that question
One hive (Two flow supers or 3 regular super supers):
Two hives (4 flow supers or 6 regular supers):
Three hives (4 flow supers or 6 regular supers):

Conclusion: The flow hive is uneconomical if keeping more than one hive for more than one year.
I encourage you to enter your own numbers and play around.
My flow hive economics simulator can be downloaded here.