Yeah, same opinion here, and I totally agree with Ken about the ebay situation.
No machine that was sold as a home machine is the same as an industrial. My Necchi BU is mounted to an industrial table/motor, and yes that wasn't totally uncommon with the old all-metal machines, since they could stand up to the abuse to some degree, but they weren't built for the same purposes that a real industrial is these days.
Even calling the Singer 20U's industrials is a stretch. They're a *heavy duty* multi-purpose machine.