The Canon ixus 800 is the camera that got me into photography many years ago. I lost it on holiday one time and ended up using a series of poor compacts and mobile phones until i found m43. Since moved through sony/fuji apsc and on sony fullframe. Why do i tell you this? Well its because these old compacts made great photos and still do, some people cant tell if i shot an image on a fullframe or a compact :) i have photos from these cameras that i would never have ever got with my fullframe or other cameras/smart phones.
Whilst technically on paper they are not as good they have loads of character and a look that sterile smart phones just cant achieve.
Lots of reasons to still use them. Small, light, cheap. Good optical zooms, nice color. Great to hand out at parties or family/children to take photos, your not going to do that with your expensive smart phone... take them on boats/canoes/climbing or other risky things where you might not risk your mobile. Even take them swimming with a waterproof case. I know you can get them for phones as well but people tend not to due to risk. Once you drowned your phone, you wont do it twice :) Old compacts have great auto modes, flashes, generally expose very well with great color and also have good macro/closeup ability. And most of all they are just fun to use and the images dont look like a smart phone. You can also use third party tools like CHDK to enable raw so you can process them in other tools if you want.
Also the sooc jpegs can be improved if needed with tools like topaz noise, sharp, photo AI. They work well.
These days ive still got a Canon G15 and a canon ixus 980 IS. Both great cameras and id pickup an ixus 800 is if i ever came across one cheap enough.
Selling an old quality campact camera is like selling a film Ricoh GR1s, Contax t3 or Nikon 35 Ti for <£100. You wont be able to find these cameras in the next years and prices will rise no matter how many megapixels your smart phones on.