I've kept them because they're important to me, and I think for at least some of the people who bid for these expensive cards, it's more about regaining a lost part of their childhood than it is about snagging a card they can hopefully sell in a few years for a profit
Learning from mistakes is also very important, and the more you dabble with a set deck list, the more confident youll get in piloting it
Urborg is played in both Modern and Legacy, showing up in Loam, B/W Midrange, Mono-Black, Grixis Control, B/G, Esper Tempo, Pox, Delver, Jund, Tezzeret, Faeries, and more
When you limit players to just one noncreature spell per turn, it throws a wrench in the plans of decks like Storm, Living End, or even niche decks like Jeskai Ascendancy
Many counterfeit cards feel glossy or fragile compared to real cards