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It's explained here. Sage itself is 100% open source, but we have a cloud hosted environment people can pay (a very reasonable amount) to use. https://cloud.sagemath.com/policies/pricing.html

You should look into support contracts for 2 reasons:

1) A lot of companies have policies against using software that they cannot buy support contract for (regardless of the quality of the support)

2) if there is an individual/small buzz reasonable option, a lot of companies and people like to pay for it as a way to given financial support.

Please charge an unreasonable amount, to secure a good source of funding for your work.

This. $200 for 4 months for 25 users works out to $2 a month per user. You could double or triple it and still be less than the personal plan.

Those large multiuser plans probably come out of grants, departmental budgets, etc. So they're likely not all that sensitive to price. Pretend you were still in academia, and had found online some great cloud-hosted software you wanted to use in a course, would it change your / your department's decision about purchasing that software if covering 70 students for a semester cost $400 vs $800 vs $1000?

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