Back when I played I had just about 4 of everything in beta, people tended to trip when they realised even your basic lands were black border cards. other than that I cant think of a reason they would have any value.
The basic lands on that list are known as the Guru Lands. Wizards had a program where people would teach other players to play Magic (known as Magic Gurus) and as a reward they would get a promo Basic land with special art. Those basics are the ones the list shows. They are expensive because not many people took part in the program so the lands are very rare and the art was nice so people these days want them.
OK, I was wondering what set Guru was, but I haven’t been keeping up on the expansions for a few years now.