isnt it'd be good if you spend at least 100 sc to get deluxe stamp card? It gives you 5 extra sc. Think like this: you spend sc 50-50 and get 2 months of special stamp card with the same amount of sc that normal stamp card offers= no profit for sc. And you spend 50+50=100 sc which gives 2x sc each time which makes total 10 which is 1 more sc at a time regarding spent sc. You can say that spending 50-50 gives more luxury items, but those items are easier to get more than sc.