There are a **** ton of people who buy really expensive professional cameras and lenses, but take photos that look no better than typical vacation snapshots the average person takes with a phone or point-and-shoot camera, and they don't really try to learn to become a better photographer either. Yes, on some level it might seem a little silly, but that is a subjective judgment of values, not ethics or legality.
If we judge all gamers by the gaming keyboards, mice, gamepads, graphics cards, monitors, and computers they own, does that mean you have to be an elite professional gamer to justify buying nice gear? Is it okay to own nice gear if you are just an average gamer who never gets high scores or win competitions?
Let's look at it from another point of view:
Person A can type 180 WPM, but never actually writes anything of merit--just trolling on the web or sending pointless texts.
Person B can only type 40 WPM, but is writing the next Great American Novel, or Oscar-winning screenplay, or coding an innovative new software that changes the way we live, or a speech that will result in a revolution that frees an oppressed people. Now, which one of them is more deserving of an expensive keyboard?
Value judgments are inherently subjective. You might place importance on WPM, but other people might place importance on enjoyment and comfort, or what is actually being written by the person using the expensive keyboard.