"Old tractors...are exerting a new kind of pull. As collecting
interests a broader, wealthier audience, prices for many models,
especially those more than 40 years old, have surged. Some of
the oldest tractors -- early 20th-century machines often powered
by steam -- can now fetch $100,000 or more, up from about
$10,000 a decade ago. Rarer models can sell for much more..."
Wall Street Journal article: http://www.starturl.com/Tractors