Crown Casino is being sued for $20 million plus damages for allegedly designing a scheme to lure a millionaire gambling addict back to the venue.

The Victorian Supreme Court has heard between 2004-2006 Gold Coast property developer Harry Kakavas lost $20 million at the casino.

His lawyers argue the casino enticed him back with cash incentives of up to $50,000 in "lucky money" and used its private jet to fly him to and from Queensland on most trips.

The court heard Mr Kakavas was subject to a interstate exclusion order, but management illegally allowed him to return to the casino where he was treated as an international VIP.

It is alleged the casino extended him more than $3.5 million in credit.

The court heard he was allowed to bet $300,000 per hand, despite the casino knowing he was a pathological gambler.

Crown Casino lawyers deny the majority of the allegations.

The trial continues.