Im an example of how a card that has been reprinted can see its price rise rather than fall, because total demand can increase faster than the number of copies on the market
Each activation improves card quality or advances mana development, which gradually pulls the deck ahead without forcing risky plays
For example, the game has a Slowpoke card with its original Base Set artwork, and then a full-art variant that removes the frame to reveal lots of other Slowpoke crawling all over the card in humorous fashion
Fight effects are like, just a single mana even with their most recent versions, and Im pretty sure adding a +1/+1 counter doesnt warrant multiplying its cost five-fold
Goblin Sharpshooter works great in all sorts of decks, not just goblins
They do give you access to some otherwise non-viable cards that are pretty potent in the archetype