For retro gamers (like me) it's usually the larger 15khz capable CRT monitors that have value today. Broadcast monitors like the Sony PVM /BVM range, large presentation displays like the Nec XM29 and arcade monitors etc.
PC CRT monitors usually won't sync below 31khz and they usually have a pitch that's too fine for old games.
Larger Crt PC monitors have some value for retro gamers for consoles like the Dreamcast, PS2 and original Xbox which can output 480p for some games. I'd personally have no interest in anything less than a 19" visible (and useable) screen though.
Still, any crt monitor above 14" is worth putting on eBay. Add "retro gaming* or "great for bartop arcade" to the listing and you'll probably find a buyer if you're not greedy.
No Color working CRT monitor should be thrown away while there's still demand. There are things that can only be done on CRT. I'd personally choose to do all gaming on a CRT if I could find one of equivalent size.
CRT is a lot better than LCD in image quality, motion resolution, contrast, lag, response, color etc.