There are two main benefits here
Well, if a Contraption would be placed onto the battlefield and it wasnt assembled, or if a Contraption would move from the battlefield to any other zone, it is instead placed into its owners scrapyard (a special graveyard for the Contraption deck)
But when we look closely at Pokemon cards, those that became very valuable were usually not just ordinary retail items bought and stored because everyone already thought they were "investments"
As with anything else, practice will make you better
Although it's still a way short of its former highs in the double digits, Milotic looks prime to return to glory, with a solid upward trajectory backing it
Chatterfang succeeded in putting Squirrels on the map in Commander