u/ComeCulito

I was at round 1 yesterday and won ~30 prizes. I spent around $280. I was then approached by a lady dress in black clothing (who I assume is GM or something. She had a similar earpiece like other worker) and another staff member asking what card I was using. Then, proceed to ask my friends what card they were using as well. She then left after that, but I found the experience very odd. Has anyone had a similar experience like that? Why would they ask what card I was using even though I paid. They also stop restocking the machines I was winning frequently, which pissed me off.