Likely a non AP. They want him to keep playing because they know they'll get it back and then some.
I think it was the mid 90's at TI in LV where the bum walks in off the street with his $400 SS check and builds it up to $1 million + playing BJ. They did not back him off. In fact, they set him up with a penthouse suite, new suits and all the booze and gourmet food he could consume. They kept him there for a week until he lost the whole nut, including the $400 he walked in the door with; then threw him back out into the street in the same smelly bum-clothes he had when he walked in. He was happy......lived like a king for a week on the TI tab and went back to his card board box with a great story to tell.
If ploppies play long enough they are certain to lose and the house knows this so they want them to stay and play until it's all gone.