Some models are very rare and collectors are fighting to own that special model, this has driven prices up. But tractor collecting is cheap compared to works of art like paintings, Vintage Cars, or Traction Engines and Steam Trains. The top prices paid for tractors rarely break the £100,000 (UK pound) mark with a few models regularly fetching prices in the £50-70,000 range due to the low numbers built, such as the Doe Triple D.