To be fair, having it for individual use comes at a fair price[0]. The real money[1] is when the grad students go into their jobs and demand jetbrains IDEs since, as you said, they don't want to learn a new IDE.

0: https://www.jetbrains.com/phpstorm/buy/#personal?billing=yea...

1: https://www.jetbrains.com/phpstorm/buy/#commercial?billing=y...