They really don't have much in common. If you want more kinder eggs, you have to walk to the store. When the mechanics are based on exploiting a skinner box as they are in games these days, breaking engagement like that pretty much ruins the whole thing. If EA or Caesars Palace required you to go to the store and buy a physical card to play again, revenue would plummet.

Could one argue that adding a small consolation prize to loot boxes overcome the gambling issue with them? "Here is your item that you paid for, oh also here is a random extra lottery item."