Appraisals are only as good as the person paying for them. Another alternative is to get your own appraisal and just tell the appraiser to low ball it. It happens all the time in divorce court. Don't ask me how I know.Yeah it will be like one of those appraisals for a diamond engagement ring.
If you think this is expensive, wait till she takes the house and half the retirement account and the guy still has to pay child support and alimony.