That's because we're used to the idea that this is a reasonable price for a creature this size
Archaeomancer costs more, but puts the card into your hand, which almost always is better and is more ripe for abuse with infinite combos (infinite turns by blinking it with Deadeye Navigator to return and cast Time Warp, for example)
Also, like I've said over and over in my articles, like here, players are motivated by different things in a game of Commander
Why would I want to get my cards graded
In The Dunwich Legacy Campaign Expansion, one to four investigators take up the search for the missing professors, launching an eight-scenario campaign that takes them from the notorious Clover Club and prestigious Miskatonic University all the way to the decrepit and treacherous town of Dunwich
Each time Spell card is activated: All non-DARK monsters in your side the Field gain 200 ATK & DEF until End Phase