I suppose there will be people out there that will lie about how much money they make at poker, especially if you have seen them play.
Saying that, they might be a complete luck box and have just been extremely lucky, but that luck will disappear eventually and I will observe a table he/she is playing at and if it's in my limits, I will sit to his/her left and play some cards. Muahahaha
I haven't met such a person though, so no.