These are usually Pokmon ex cards or Supporter cards and are textured
Three more yet-unnamed sets will launch after Fabled , but Disney hasnt revealed details about those yet.
The ex in Pokemon ex stands for extra since ex related Pokemon and abilities often have extra effects to them and their attacks
A 100-150% profit margin is nothing to scoff at over a 5-6 year period, and those who saw the sets potential, especially as WotC neglected to reprint allied fetchlands, made serious money
While having the treasure is nice, I think that the option of drawing more cards is worth the trade off
In the above article's comments, PokBeach webmaster Water Pokmon Master shows they're a big fan, saying, " You can't overuse galaxy holofoil