I don't collect as such. Have sold them and repaired lots. Sold a couple as a matter of fact in the last couple weeks. Did I make money. Lucky to make $20 a machine depending on time of year and demand. Most people want really clean machines cheap, and this is what I do. Its fun to tinker with Vacs clean them up like new and send them on their way to a proud new owner.
If you want to learn repairing gradually work into an Electrolux, they are tricky to take apart but easy once you know how, and they have a snake pit of wiring. Trouble shooting is scary for most. Pick up a beater and practise on it.