I claim this cannot be a simple coincidence. The rich have always gambled, but lower end classes weren't gambling that much in the past as far as I know. There weren't definitely as many gambling spots all over the place before.
I can think of at least two things that this is happening in your country. First of all, it is true that lower end classes weren't gambling so much. The reason why they gamble more now is that they became poorer. The global wealth is accumulated to little people so the poor class tries to gain their losses by gambling. It is reasonable but they will probably be poorer eventually.
And also, during Christmas holidays casinos do aggressive marketing in order to attract customers. It is the most active period of sales for them.