How much would it cost to have braces to get buck teeth? Are orthodontists ethically allowed to do this?

I find your Question a bit strange, maybe you should seek a Therapy instead.

If you really really want buck teeth, carry on with the thumb-sucking and develop a habit of pushing your tongue against your upper front teeth. For best effect, do this most of the day - teeth generally need 8 hours of _continuous_ forces to even begin moving.

Orthodontist wise, I don't think you'll find anyone to do this for you. Orthodontists are specialist dentists, and adhere to professional ethics and the hippocratic oath ('do no harm'). Giving you buck teeth would qualify as doing harm, because you'd be more likely to damage teeth if they stick out more. You might find a dodgy backstreet orthodontist to do it, but that's inadvisable for obvious reasons :)

Honestly the thumb sucking would make it worse. If you have ortho. insureance that should cover the braces.

I don't think you'd find an orthodontist that would be willing to do it, to be honest.

Why would you want buck teeth?