Appraisal..oh its completely meaning less. There are many of cases when the appraisal says 0 while thats sale price is x/xx/xxx/xxxx and much more. The conclusion is :- The respected buyer has ability to finalize the value but it is not appraisal.
Undeveloped domain values will always be zero $0. Just look at how many 1,2,3,4,5+ L .coms domains are rotting away on ʬʬʬ "If you own a Ferrari but can't impress gold diggers there's something wrong" . Potential Valuation can be debated.