The 4 10's removed??

#1
I was told that at Mohegan Sun they remove the 4 10 cards from each of the 6 decks they use. Is this true or even common practice everywhere?
Also if this is true is it even worth playing or would you have to start your count at something else like -6 cause you know all those 10 cards are gone and the true count will put you at -6. I just don't get how, if this is true, you could ever expect to get a favorable count. Please help me with this.
 
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