Most amex cards have an annual fee ranging from £60 - £450, and then the invitation only cards so there is cost to the user, also a minimum annual income of £20k for green and gold and £40k for platinum (for the card holder only - combined income doesn't count)
So I would say that the amex user is usually above the average wealth.
My Nectar Amex doesn't cost me a penny and I've already earn t over £100 in nectar points in about 8 months of having it. Also got £35 cashback from topcashback so it has made me a fair little sum.
