well, you don't have to right? you know, some players are just too young in this game, you can't expect them to have the decks having them obtain a random card each time. As a platinum player myself, it's different. I choose to put in dead cards once in a while so that i help people to farm, but i'm able to form any decks given that i've almost every card (6 un-up and 6 upgraded) in my deck.
Remember the T50 decks? well, it's up to those people to play whatever they like. Play well, you stay, play badly, you get kicked out of top 500 real soon.
So why bother the cards that they chose? the card was to assist them, but if they failed to capitalize that, it's up- to them and they were not doing anything wrong