There are plenty of other kinds of decks you can build and I cant list all of them, but these archetypes should be enough for you to understand what you can expect from other players and point you in the right direction to get started
I suspect its psychological
It's highly unlikely that any of the newly released cards bearing original artwork and a tiny golden arches logo will come anywhere near that value, but offers currently on eBay include a set of 50 sealed packs for nearly $1,000, with 25 already sold, and individual cards like Pikachu falling in the $20-40 range
Consider these different deck theme types for some inspiration
I finally found an artist I was interested in working with through word of mouth, and their portfolio was very much in the vein of the kind of work I wanted done
Guidelight Optimizer Blue cards usually trim down artifact costs