People did care, which is why people who played games competitively continued to use CRT monitors well into the crappy LCD days.
Heck, some people still use CRTs. There's not too much wrong with them other than being big, heavy, and not being able to display 4k or typically beeing only 4:3.
This only happens with TVs or very low quality monitors. The flyback transformer vibrates at a frequency of ~15.7k Hz which is audible to the human ear. However, most PC CRT monitors have a flyback transformer that vibrates at ~32k Hz, which is beyond the human hearing range. So if you are hearing the high frequency noise some CRTs make, it is most likely not coming from a PC monitor.
Its a sound thats a part of the experience, and your brain tunes it out pretty quickly after repeated exposure to it. If the TV is playing sound such as game audio or music it becomes almost undetectable. Unless there is a problem with the flyback transformer circuit, which causes the volume to be higher than its supposed to be.
ebay? If you can get an IBM P77 or Sony G220 (they are the same) in good working condition you should be golden. Those are awesome. They go up 170Hz, 75Hz at 1600x1200. And can even do 2048x1536 although that would be out of specs and only 60Hz (barely usable but fucking impressive).
You will 100% overpay if you get one on eBay. Best place is to try asking businesses, schools, or local news stations if they have old CRTs you can look at they'd be willing to sell to you. News stations preferrably since they usually had very high quality BVMs.