I believe there have been a couple successful breedings of doreanus, but being a largely WC monitor, most of them get sold to inexperienced keepers. I imagine its really hard to justify the cost to breed the animal then attempt to sell the offspring to cover your costs when people can buy them for about $200 at a herp show. Plus all the internal damage these animals suffer from being collected and stored for who knows how long before being shipped here, puts the keeper at an immediate disadvantage. You might luck out and get a decent animal, but the odds are against you, then getting to find a good working pair? The odds increase again. Then say you do find two healthy animals, of opposite sex, then you have to house and feed them until they reach a size to be able to breed, then you have to figure out nesting. What temps, shape, feel, material, humidity, will the female want to lay. That's a whole lotta work for the average keeper.
And unfortunately I think (just my opinion on all this stuff) most people are just happy that their monitor eats, let alone all the rest.
Either way you got a cool little guy there. Good luck with him!!
Mike