I see it like this: if there is anything you use more than a an hour a day, get a thing that feels good, is functional and makes you happy.

Just like different guitars play differently, just like different shoes feel differently, different keyboards feel differently too.

If you are fine with a non-mechanical one, no need to defend yourself. Some people like clicky mechanical keyboards, some like linear ones, some want a heavy touch, some a light touch, some don't feel any difference at all, etc.

A good keyboard will last you at least a decade, multiply these hours by that and even 200$ would be nearly next to nothing given the time you use it. Do you really need it? Probably not (unless you use it for ergonomics). But if you can afford it, why not.