MIND GAMES Cuban not big on rules, even when he makes them

Mark Cuban is game for a reality series.

He observed auditions held Saturday in Dallas for the ABC show TheBenefactor" in which he is giving away $1 million of his money.

And the ground rules are what exactly?

It's like Willy Wonka & the Chocolate Factory," Cuban told theDallas Morning News. When you walked into Willy's factory, you had noidea what the game was."

The audition attracted more than 500 persons hoping to live in aDallas house for …