I've been burned too many times on "simple, cheap, multi-user" shared inboxes. Most recently Groove HQ where it went from $20 for our team of 3 to $45/seat for our team of 5 over the course of a few years. It was still worth it, but when I left that company, I had to switch to a shared gmail account because I'm not dropping $135/mo for a software project that may or may not take off.
We’re specifically building this _not_ to hoover up every dollar on the table, but to serve smaller groups that have been left out in the cold by "bigger" tools, and who get screwed by per-seat pricing. We believe there are enough teams who fit this profile to be profitable.
There’s a difference between making profit and maximizing profit. the capitalists will call us crazy, but we're not here to maximize profit.
I have teams with 1-2 permanent members and 8 more that may or may not want to check like... maybe once a week at most. Seat limits really mess with the "compliance officer needs to do something every once in a while but do we really need to pay for a separate seat?" issue with per-seat pricing.
A heavy user and a one-time-monthly user are different costs to the product but charge me the same. ;_;