It seems Amex is becoming less and less accepted in these difficult times for retailers.
This impression must be really spend pattern related I think. Before I became an Amex card holder I didn't know and didn't care if it was accepted or not ... acceptance never hit my radar. Now however, I actively change my spend habits to maximise points earn (not only for Amex) and as such, Amex acceptance is very much front and centre. As a result of paying attention and now almost subconsciously choosing merchants, I am finding that more and more places of interest to me are happy and accepting of Amex with no surcharge.
So whilst I'm working the system, so to speak, I am not oblivious to the fact that the system is also working me
An example of what I mean is, my local computer store charges 3% on Amex, Dell doesn't charge extra. My laptop purchases, and IT stuff in general, is now, as if by magic, being procured through Dell. I don't spend more, but my spend has shifted.
My company charge card is an Amex Corporate green, so, purchases made on it obviously have to be made at merchants who accept Amex, and the secondary concern is those who also don't charge a surcharge.
As my spend pattern has morphed since choosing Amex cards, I find that easily 80-90% is flowing through an Amex card of one variety or another and the percentage is still growing as I wean out merchants who either surcharge or only accept M/C and VISA.
My point being that in my own world bubble, almost everyone I spend money with accepts Amex without an additional charge.... so my perception becomes that 'everyone' (pretty much) accepts Amex