The ESD bag does its job because it's coated with a metallic film/grid that dissipates static electricity. Putting a running mobo on one could very likely short the traces and fry it.
I needed to set up a temporary computer, and the board I had wouldn't fit my spare case. So I set the board on a cardboard box (make sure it's free of staples or metallic ink!) next to the case and used its power supply. Worked just fine.
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