I have wondered the same thing, why don't psychics just win the lotto or something.
Everyone wonders this, and the answer is because there are no Psychics. No one has ever demonstrated otherwise. When the conditions favor the person claiming to be a Psychic, then it works, but that's because it's a trick, magicians need time to prep. But when put to the test using the scientific method, it fails 100% of the time. The James Randi foundation has been offering one million dollars to anyone that can prove that they have psychic powers, no one has ever managed to prove it, and collect the reward money. Most people won't even accept the challenge, and the few that do, either fail or worse yet, are exposed as frauds. Some of these folks honestly thought they had powers because the ignored all of the other factors that could explain the situation, or in some cases they were just willing to be fooled by their own notions. Requiring a birthdate is the first sign of trickery, which in itself can be very revealing of a person in terms of their generation and what they have been exposed to. The "Psychic" can immediately eliminate many things about someone simply by knowing their birthdate, or their age.
I'd like to imagine that super natural powers exist, it's a fun idea and something for great discussions and entertainment, but I care more for what is true, than I do for what I can imagine.
Ref: James Randi and his $1,000,000.00 challenge:
https://www.youtube.com/watch?v=M9w7jHYriFoThat being said, and disregarding my thoughts on the matter. Good on you for offering a free service. However, there are different types of Psychic claims and you might want to pinpoint the one you intend to demonstrate, is it: clairvoyance, clairsentience, clairaudience, or claircognizance? For example shows about Clairvoyance often have the Psychic helping cops to find the body of a murder victim. Which one is your friend demonstrating?