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What is $500 for a tool if it really did make you more productive?What is $500 for a tool to you if you make lots of money? Sure, that is one question.
The more relevant question is: what is $500 for the tool, to the tool?
In 2020, what $500 for a tool is a kiss of death. Nobody learns it; no third-party ecosystem, no jobs, ...
OK, you can have some free-with-limitations student or personal editions or whatever. In the FOSS-dominated landscape, that's still a kiss of death. The entire quality and scope depends on the in-house development behind closed doors, which is funded by the $500 licenses.
I think, without the multiple efforts to have free Lisp over the past 3+ decades, Lisp would be history.