But a collection is a different variable in consumer spending, and of course a collection might not necessarily entice people to spend immediately. Some people might save up their DCs till spring when there are legion items or save up simply for other reasons. And it's not like DC offers happen rarely... they're usually twice a year, one during Black Friday and one during the summer. The strategy behind employing deals near those holiday times (close to Christmas or close to summer vacation) is that players have time off to play video games compared to most other times of the year, and holiday times usually attract more people, especially new players. It's not so much about motivating players to spend their DCs immediately, but to bring in new faces who might enjoy the game and want to support the game, or let familiar faces take advantage of the DC bonus for practically any reason (to spend immediately, later on, etc.).