How is investing $120 on a keyboard that is extremely comfortable for me to use that I’ve kept since the USB 1.0 era overspending?

I’m far from wealthy. I bought that keyboard when I was working a $10/hour part time job.

If you had a WFH job, would you buy a $20 chair from Walmart or invest $100-$200 on a chair where you’ll actually be comfortable all day and not develop back problems? And you don’t have to be wealthy to work a WFH job either. My last job was a hybrid WFH/in-office job. I was paid less than what would be minimum wage in California.