Interesting question and no one knows for sure how Club Royales offers work. But I think that it matters how much you gamble on each cruise. This year I have been on 2 cruises, on the first one I made avout 700 points and got some offers but very few. Never had more than 2 offers at the same time and usually only 500 off or an inside on a 3-4 night cruise on very select dates. 2 months later I went on my second cruise and got 2200 points, now I get new offers every monday, currently have line 7 or 8 offers ranging from 3 day to 9 day cruises.
I suspect if I dont make a similar amount of points on my august -23 cruise offers will not come as often but we will see.