An important thing to consider is that over the years Hoover's marketing strategy changed, and decidedly so when they sold out to other ownership. In the beginning Hoover built high-end vacuums, sparing no expense in the name of quality. They supported their products with readily available parts for many years after a particular model was no longer manufactured. With ever-increasing less expensive vacuums flooding the scene and taking a larger share of the market, Hoover moved in a new direction, trying to compete better in a throwaway culture. You can see the same trend in other appliances and home furnishings.