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Thanks for your answer. I imagined so. But I could also think of some legitimate heavy-duty users who could threaten your profitability. Is there any fine print for those cases?

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I don't think so. The cost of running something like Mailchimp isn't in having a couple of servers and some bandwidth, I imagine; the cost is in dealing with spammers, overzealous spam-fighters and people who'd rather hit "report as spam" than unsubscribe. Number of subscribers is not a bad metric.

ETA: Also see bjonathan's comment at http://news.ycombinator.com/item?id=2170619: Amazon, which probably offers something closer to "server and bandwidth", is much cheaper.

No fine-print. Our high volume plans for large email lists are not unlimited, but smaller lists are completely free to send as much as they want. In practice, you'll hit our anti-spam limits long before you hurt our profitability if you try to send lots of email to a smaller list.

Thanks for the explanation. I'm glad you stopped lurking, and to have tripled your karma!

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