You can't compare like that.
Last time HotWheels sell in 70s & 80s priced how much? Rm3?
Nowadays cost like standard Rm10 & that's the releases that no-one wanted. Same goes for Digimon. Inflation and market trend changed the target audiences to adult collectors increasing the prices.

Any collector toys also like this. If you think this is the worst look at the pricing of Kamen Rider, super sentai, Ultraman belt henshin toys etc. Or Transformers toys(Hasbro quality worst than Bandai)

Not sure why need to compare toys from 20 years back