The fact that chase cards are most commonly found in Collector Boosters has meant they sold out quickly soon after going up for preorder earlier in the yrar, and now command a high price on trusted resale sites like TCGPlayer
similar to how Landing a stagger and then unleashing a series of powerful abilities was the key to victory in FF13
Between Target's TCG expansion, The Pokmon Center's recent massive 30th anniversary drops, and leaks of people opening packs of the unreleased set months in advance, it seems like The Pokmon Company is doing its best to meet that heightened demand
They typically switch zones with an activated or triggered ability, though some cast themselves from the graveyard
As it stands, any card thats been out for a few years with a low amount of sales can be easily manipulated
The flurry ability of casting two spells in a turn is not something that just goes away from Magic, if anything it will always gain more support as new cards are released