It sounds pricy but not crazy unreasonable, if $10/mo for a core productivity tool (per employee) is too much, I wonder what that 1k employee business is actually doing. In the USA the median wage is $41,000/yr per employee, with tech companies paying far more, so like 0.02% per employee? Does Slack make an employee more than 0.02% productive vs trying to use IRC or Discord? I'd argue it's pretty obvious that it does.