One factor to consider is the rarity of the cards
Gilgamesh, Weapon Collector (Godo, Bandit Warlord) Rating: 6/10 Godo, Bandit Warlord cheats out an equipment card from your library directly onto the battlefield, which is basically like getting a free creature in Final Fantasy Limited
I think it's because of the way the lines have been drawn
Sure, you have to deal combat damage with a Dino to pay the prowl cost, but Dinosaurs are all about attacking, so that should be a trivial feat to achieve
Then you have the Spell card Soul Unseal with the very soul of the chips unsealed from the bag
Training, world saving, or simply wasting time, there's never a shortage of reasons for these kids to bust out their trading cards and square off against each other