Mattermost team here. Thanks for your feedback,
While pricing is set that way for a purpose, we are always looking for ways to improve and we're keenly interested in what everyone has to say.
Our focus for Enterprise has been large organizations with sophisticated needs and it's important for us to have conversations and demonstrations with the people doing the evaluation so they fully understand what we're offering.
That said, there are people who use our free Team Edition or have read through our docs that just want a "buy" button for E20.
I'll bring this up and see what we can do.
PS: Regarding the word "fix", my personal view is that it's okay for a commercial product, because people are buying it as a customer. Enterprise Edition is a commercial product.
That said, many open source communities are adopting a principle of "kindness" and having feedback phrased positively where possible. People work hard to make open source software and give it away, and if conversations started on a positive note... well, why not?