JayUtah
Penultimate Amazing
I tend to discredit the idea that actual genealogical research is made by the mediums for an ordinary, low-profiled session. As Scorpion puts it, the few shillings that he gave, would not be worth it.
If money is the only desired end product, that makes sense. But as I mentioned earlier, because of this one reading Scorpion is now championing her authenticity up to 40 years later. Fleecing the flock is one thing, but retaining a flock to fleece is another. All these tricks operate according to some variant of "I can't believe anyone would go to the trouble to..." Turning the cost-benefit analysis on its head is mentalism's bread and butter.
But you're right that we don't throw practicality entirely out the window. Yes, I think it's far more likely that the medium obtained her information via a friendly, low-cost tip. But Scorpion readily assures us that it didn't happen that way. So if we grant him that, is it still possible to do a reading? That is, what can the medium have found out using only publicly available information? If we find that ordinary vital records give enough information, then we consider the worst-case scenario still to be effective. And this is important when the proffered explanation (supernatural intervention) is posited as the default. "It must be X because no other alternative is possible." When that's the syllogism, then "possible" can't be interchanged with "practical" or "profitable" with the same logical rigor.