It almost certainly won't raise the value as much as it costs to have it done. It might even make the knife harder to sell because many buyers are looking for a particular make and model of a knife (which would be a known quantity to them), not a variation of that. So the thing is, you need the "right buyer" for it to be worth more, and that may mean waiting longer while trying to sell it. This is the same logic that applies to the question of whether a house is worth more if it has a swimming pool (yes for a few buyers, no for most others in most areas).
Also, the more a Krein regrind is used and resharpened, the wider the edge gets and therefore the advantages diminish over time. A potential buyer will probably value a used regrind less than a fresh one for that reason. I agree with others that you should Krein it if you want to keep it and use it like that. I would also say don't Krein it if you intend to sell it. Let the buyer decide if they want to Krein it.