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While Checker isn't recovering, it performs far better than Thruster and Void, despite currently being at the same demand as those, it can also get base value consistently (both variants), unlike the 2 aforementioned cosmetics which sometimes struggle to get base.
Duped Checker is relatively alright in trading, it can often get base value (unlike duped Void which often gets lowballed), and while it isn't frequently looked for by traders, it isn't necessarily declined in trades either.
Supply is widely distributed — no single holder owns enough to register as a hoarder.