Re:Typical casinos (Score 1)

They do use more decks and keep half aside. You will see more 6 deck games then double or single deck games. When they shuffle they use a flat shuffle that looks something like you would use for dominos. Once they get the deck in order the single and double deck games will be cut by a player inserting a plastic card. Then the dealer will insert a plastic card in the midst of the shuffled deck and deal away until they deal out the plastic card. This signals a new deal the next hand. A 6 deck show will usually have about 10-12 hands for a table of 4 players and the dealer. A single deck game will usually shuffle every hand with 4 players.

Also the fewer number of decks used will increase the odds of blackjacks being dealt.