Overlord of the Boilerbilges can either be a 6-mana 5/5 red creature that can remove something (or hit face) with its attack trigger, or just a burn spell for 4 mana
With Rubys control cards, you can Banish bothersome cards that enable the opponents game plan, slowing them down on the board and potentially putting you ahead of the opponent
Pokemon TCG Pocket also acknowledges the genre's huge social component
In all seriousness, though, given how much people love their Relentless Rats and Rat Colony decks, and given just how perfect Ashcoat is for a deck looking to swarm the board with Rats, Rats and more Rats, I think $40 is actually a pretty unsurprising price
Nettlecyst Nettlecyst might see play in artifact decks more than enchantment decks, but All That Glitters attached to a creature that leaves an equipment behind might be worth playing for aggressive decks, even if it doesn't directly trigger enchantment synergies