Opaline is still an uncommon mutation. If you want to get into opalines, this could be a useful bird. Opaline is sex-linked recessive so pairing this male to a plain blue or violet will give you some violet opaline females.
I don't remember the price of plain violets there, I think it was around $1000 a pair?
If so then this price seems to be on the expensive side given that it will take 2 years to breed.
I don't really have a reference price for opalines. It is just my gut feeling.
Ask around and see if the opaline mutation is in demand.