Should I buy Van with a bad PCM?

It s a Honda Odyssey. 250,000 miles. The body is mint. Transmission rebuilt 2 years ago. New radiator and timing belt. New brakes and tires. Cold ac. The only thing is that the computer is going bad and it s causing the battery to drain overnight. The guy only wants 500 bucks for it. I think it s a good price and deal. New computer from dealer is about 1200 installed. I think it is worth it

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