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Not using mixpanel right now (was using it a while ago) and I bought the plan just because. I'm sure it's going to come in handy.

I did the same. We're launching another site soon, so it may work as an experiment there. $17 is impossible to say no to, even if it never gets used.

Although I have to wonder why $17? Seems rather arbitrary.

I'm sure they crunched the numbers to figure out the optimal price that allowed them to profit on an upsell later ;)