According to Realtor.com, when making upgrades to sell your home, adding attic insulation is the most cost effective upgrade. In fact, adding insulation is the only upgrade that will bring you more money than you spend. The article doesn't specifically say this but I would assume that this would be more true in an un-insulated or under insulated home. If your home is already well insulated, I would not invest this way.
Here are some of the other examples of improvements you can make and their return on investment (ROI):
Good Investments with Reasonable ROI
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