Another reason not to grade from a pure investment angle is that older slabs sell for less. If you aren't selling soon, you don't know what the popular slab of 2040 will be. Especially with AI on the cusp, it may not be PSA in 10 years. It might be CSG or a company that doesn't exist yet. No point in paying all the fees for a substantial risk that you will have to grade again with the trendy decision maker of the future.
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