On Ebay, copies can be had for closer to $200, especially if you are willing to risk international shipping options
#6 This prices look very underestimated
Cards and life are a big draw, but the creature is so vulnerable and theres a lot of work to set up that first card and lifegain
If you have ways to drain your opponents, the Archfiend will power that engine while also denying them lifelink if their deck is built around that
Commander is a singleton format, which means you cant have more than one of each card in your deck - unless its a basic land or it has a special rule allowing you to have multiple written on the card
Speaking of options, I would definitely play Fireblade Artist over Robber of the Rich if it doesnt require (B)(R), there are only 8 sources that allow you to play 1 drop followed by the Artist, not sure is worth biting the bullet, even though its a haste Human that can utilize the tokens and make a fine pair with Judith