You can’t easily derive “final settlement” as a percentage of a demand on the policy maximums - it’s totally dependent on the underlying injury.
You understand how personal injury suits work, right? If I crash into you, and I only carry $100,000 in third party liability coverage, that is all the insurance company will ever be on the hook for. You are suing me, not my insurance company.
So whether I turn you into a quadraplege or I break your arm and you require a cast and some physio would completely change the amount the insurance company would settle for.
So unless it’s a clear case where the suit is one that will have a very high certainty of a plaintiff’s verdict for 100%+ of the policy limits, they won’t settle for anything close to their policy limits. Because they can always try their hand at trial, knowing that they have a set downside risk.
If I had to conservatively guess, I’d venture a guess about maybe halfway between the opening demand and 0. Again, that’s a ROUGH estimate. So for a 500k demand, that’s 250k settlement. Take out litigation expenses (expert witnesses, deposition feest, etc), 240k. Now that’s 80k to the attorney. This has to cover all the non-chargeable expenses, office overhead, etc. Probably, at the end of the day, the attorney profits 40k on this case. This is after 2-3 years of litigation, btw. And, again, you grossly overestimate how many policy max cases walk in a door. Most would probably settle for far closer to 50k.
Plaintiff’s side PI work is much unevenly distributed. There are a few players who make significantly more than an average attorney (indeed, they make the most of all attorneys) but many cannot subsist on contingency cases alone (indeed, this takes a large capital reserve to fund multiple litigation expenses for many years).
I would think that for every one settling case a PI attorney has, there are 5 cases that wound up costing a fair bit of time and effort that result in low settlements that wind up paying for the overhead associated with that case.