Board 8 > Why did the Rhythm Heaven games skyrocket in price?

(+) Yeah! (+)

I know Board 8 has some collectors with their ears to the ground, so I'm hoping you all might be able to share some insight here. Rhythm Heaven (DS) and Rhythm Heaven Fever were cheap games for years; you could get complete copies for $10, maybe $15 with ease. Now Rhythm Heaven Fever regularly nets $70+ and the DS one is catching up fast.

I know COVID-19 has caused a lot of price spikes on older games, but they're usually not this significant (especially on common games like these). Did this series become a Let's Play hit or something? Or did people just wake up to how good these games are?

---