Deck protectors for pit. I know I'm already 3 years late in responce but I'm sure you've already gone through 1 maybe 2 sets of protectors. For what? Play the game, lets the cards wear. If the card get too recognizable buy a new game. It cost you the same as replacing sleeves (which you always have to replace all of them because the new ones will look better). Play the game and enjoy it. Give the old cards to someone who doesn't own it and doesn't yet know how all the card are marked. It'll also let you finally start using your second deck.
Re: how many cards should i have?