Answers come from this page's recorded prices and verified PSA sold medians, with the sample size behind each one.
Recorded moonstone data only. Not financial advice.
The short, expensive tail of the set.
You can own 84 of the 94 priced cards in Hidden Fates: Shiny Vault for about $1,308. The median card is $12.39. The remaining $2,146 sits in just 10 chase cards, and one of them (Charizard GX, $764) is 22% of the entire set on its own. A full set is not one long climb. It is a cheap, fast 38% and then a very short, very expensive tail.
Computed from this set's own recorded value series; windows are stated and nothing is modeled. Medians anchor the return windows so a single outlier day never makes the figure.
Breadth: 50 cards up · 11 down · 33 flat over 30 days. Biggest mover: Kirlia (+28.3%).