I've had two this year. I used the first one for my September trip - it was for 40% room discount. I just yesterday received another one for room discount. I wonder if it was because I was pricing out some trips for next year on the website and saved them.

I can tell you I never used to get them until last year. That was after I registered on their website, and ordered custom maps. I haven't opened a new credit card account in about ten years, so don't think that's it for me.