Haven't been following along too much on this thread, but has it been decided that the best old frame for a commuter bike is one that you can put two wheels, a drive train, brakes, cockpit and saddle on and when you pedal it, the thing goes forward, when you turn the handlebars it goes where you point it, and the brakes work?
In other words, the best old frame for a commuter bike is just about any old frame?
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.