Backstory - Last year I held a Marriott Visa card. After ~6 months I was kicked out of the program, they wouldn't say why. My credit score is through the roof. I always pay bills on time and often ahead of schedule. My guess although they wouldn't answer questions - I'm extremely good at generating points. My business runs 10-12 events in a year that are run at Marriott hotels. I used the card to pay for all of these events. Since they paid 5 points on a $1 of spend at a Marriott and we assume a point is worth ~$0.0075 then my events cost Visa approx 3.25%. Ok.

Fast forward to 2018 I just applied for and received a SPG AMEX (Personal). Before I make the same mistake again I would like to know if anyone has any experience.

What spending patterns (if any) have you seen get people in trouble with AMEX? (again I always pay my bills on time).

Cheers
Mark