Even remodeling a home doesn't increase the value of a home during a real estate transaction. A particular feature can drive the sale but that's not the same as impacting (or increasing) value. Values is driven by comparable sales. Someone might bid on a house because they like the fact it has an EVSE installed but they are going to bid according to the current market conditions and pay, ultimately, what the appraiser and bank conclude the market value actually is.
Also, in order to increase value the property would have to sell for more than it cost to install whatever feature is being touted as the value add. Sellers of these kinds of systems, EVSEs, solar power, security, etc. pump their resale potential but the harsh reality is that they become a hindrance in the sale. Your hypothetical buyer who owns an EV already has an EVSE. If they aren't bringing it along, they already know what it costs to install one--and when they do install one they are going to buy whatever the newest tech is (same logic with all the other hi-tech "value" adds). Unless it's permanently installed it's not even a fixture that comes with the property anyway but that's a minor point.
While there is an appraiser section for energy updates, EVSEs wouldn't generally fit into that category and any positive adjustments would be completely outpaced by what appraisers call, "functional obsolescence." Wife and I currently own a handful of rentals in San Diego area and we've gone through this process when we remodeled our last primary home and know how long the permitting process is in the area (months). So while I think people asking on the forums were planning on using licensed electricians for their EVSE installs, I doubt many of them went through a permitting process. It's not a big deal in SoCal--if you exclude non-permitted work you're going to exclude nearly every property for sale--but it does mean you're going to have a difficult time asking for anything regarding the install. As soon as you try to list it as a feature, a savvy agent is going to push back with you either include for free or rip it out at your own cost.
Of course, everything I'm saying is regarding a normal market. In the past year's market many homes are going under contract without the buyer even seeing inside and closing without an inspection (and then paying cash over appraised value). If you're approaching this discussion from a value perspective, you'll get that $500 dollars much easier by spending $20 bucks on a gallon of paint. If I was your buyer I certainly agree I would notice and appreciate a permanently installed EVSE. It would tell me a little something about what kind of owner you were. I would also be more likely to bid on your house if an exact match down the road was missing the EVSE all other variables being equal. That said, I wouldn't pay you more for the house because of it and I haven't met or heard of a buyer doing it in practice, either. It could come in handy during negotiations (I noticed that old water heater and would like a seller's credit; how about we convey the EVSE to you instead?).
People do this with cars, too. They add up all the maintenance and aftermarket additions and come up with a figure based on those factors rather than what other similar vehicles with same mileage are selling for and their car sits around waiting for the mythical buyer who is going to appreciate all of their personalized touches that created value and joy for the owner. If you happen to come across a buyer who buys into the notion that you've added value with your modifications (to home or vehicle) fantastic! My advice, however, is do your upgrades for you not the next owner.
