Rust! Should I sell it?

I’m not super serious about selling it, more of a rant. I have a welder and have no issue cutting and fixing it. I didn’t find the rust until I got on my back in the trunk and looked at the underside of the package tray and then started stabbing around with a screw driver.

Sucks, I’m sure everyone wants a fully rust free old car, but is what it is. Plus I don’t have rust free car kinda money haha!
Lol, OK, nevermind post above...:)