It isn't a strategy, it is a simple mathematical fact that the boxes are collectively worth $980,000 each.
Whether the 98% chance of a 2% ROI is worth the 2% risk of a 100% loss is a different question.
The valuation including risk will be different than the simple valuation of the boxes and will vary widely from person to person depending on risk aversion.
And, of course, the example is irrelevant to actual investing since risk is not an absolute known value in investing. What is described with the boxes is simply casino-style gambling as demonstrated on Deal or No Deal.
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