I was talking to a friend of mine recently about this. It’s rare to find sets/ master sets of Aquapolis or Skyridge. I wonder myself with the meteoric rise of the sealed boxes what a complete set/ master set value would be now. With as large as these sets are and difficulty to put together I’d have to guess that they should see a significant increase in value. But so few are ever available for sale that I have no idea where the market is currently.
I actually had a very hard time selling my near complete masterset. Had full reverse and holo cards and 5 reverse and 1 regular crystal. Everything was mint condition.
Unfortunately had to sell quickly because I needed money at that time, had it on Ebay for a while and had no bites at all. Sold for around 3k eventually