In the later parts of games, when you have enough lands or if you are just flooding, these become spells you can cast and are not just dead in your hand
Guaranteed Hits Every Box Delivers Starting with the MEGA series, every Japanese box guarantees at least two SR-or-higher cards: one Item/Stadium SR and one Pokemon or Supporter SR+
SET/SERIES: POKEMON JUNGLE SET (UNLIMITED EDITION) RARITY: COMMON FINISH: REGULAR, NON-HOLO 50 HP NINTENDO, CREATURES, GAMEFREAK, WIZARDS, WOTC ABOUT: POKEMON CARDS, REFERRED TO AS TRADING CARD GAMES (TCG) OR NON-SPORTS CARDS, ARE RED HOT, AND ARE AMONG THE MOST POPULAR TCG GAMES FOR BOTH COLLECTING & PLAYING
After all, while not every player will be particularly excited by every card, if a given set's overall theme is still appealing, most people will want to collect it