Hi,
I assume you are refering to the Maytag N2LPS at auction attached to the link.
I'm sure the "switch" he's refering to is the black lever you can see in the second picture... it's a mechanical control that engauges the pump to drain the tub. I can see how it's mistaken for an electrical switch since they are labled "ON/OFF" but all Maytag Wringers simply plug in to activate the motor... no switch.
Now as to why it didn't work, a few possible reasons: If the tub's empty, then you're not going to get any water so the lever will appear not to be working. OR the pump/linkage are slightly out of adjustment and if everything else is good, it should be an easy fix. (the lever moves the pump which causes a friction wheel to drag against a pully.)
The other thing about these machines (Maytag Wringers) is that the late model units originally had a squeeze-bulb safety floor switch so that the wringers could be stopped instantly. We're decades down the road, so these rubber blub switches are usually no good and not available for replacement (and generally hated as a nusance). There is a fix that uses a screw to hold the linkage closed in the absense of the squeeze bulb, but since the ad specifically says the wringer still works, somebody may have already taken care of this for you.
The price of $100 is not a steal, but it's not unrealistic (I was just looking at a Craig's list for another N2 for $300, which is crazzzy). If you enjoy barganing, you might get it down lower, but frankly it does look like a good machine, and the price looks fair.
I have an NX (the stripped-down model) that I use for a daily driver and I've fallen in love with it. If you've never used a wringer be aware that they are time consuming, wet, and labor intensive devices. I am an AutoCAD draftsman, so I am already spending too much time in front of a computer, so wash day is how I get in some exercize.
Last thought: if you transport it home, REMOVE the wringer head and when you place the washer on its side, be sure the wringer support tube is on the TOP of the machine. If it's on the BOTTOM, oil will leak out and make a delux mess.
Let us know if you need any more info.