I'm not sure what you're calling unreasonable -- the fact that you have to pay for something that thousands upon thousands of people took time developing over decades for you, or the fact that (you think) there is no free/open source alternative. Which is it?
Anyway, that's like a hundred times less than I pay. Doesn't seem much different than textbooks you have to buy that you only use twice a week. If you don't like it, see the FAQ for alternatives.
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