I'm in the middle of a lower-end (for my area) rehab (Chandler, AZ). I just decided to install cabinets in the laundry room, and in a hallway alcove. My cost for the cabinets and installation for these areas is $2,000.
Of course there's no way that these improvements will add $2,000 to my asking price. However, after 20 years in the business my instincts told me if I didn't add these cabinets (not a lot of storage in the house) the perception with buyers (and their Realtors) would be that I'm cheap, which may lead them to wonder what other corners I cut on the project. This in turn may lead to a lower offer price, or no offer at all. Rehabs may not "accomplish value", but they can certainly subtract from value if not done correctly (or at all).
My standard rule of thumb is make improvements to the home that match what is "normal and customary" for the neighborhood. Buyer's will pay a premium for a fully-remodeled home, but it's difficult to estimate how much more. All I know is cutting corners can lead to longer hold times and lower offers.