Owning and operating warbirds goes far beyond the sticker price. Hangar expenses, insurance, annual maintenance, preventative maintenance, actual maintenance (when things break), spares acquisition, and operational costs are just a sampling of what you can expect to pay. When I owned my T-6, the fuel bill for a 2 hour jaunt was upwards of $450.00 at the costs then. That did not include the costs I needed to set aside for engine and prop overhaul, maintenance, and insurance costs. Start pushing it into the more exotic and rare aircraft and the costs go up exponentially.