I don't always get all 3 plunders off, but I do maybe 5 times a week - the other days I only succeed for two of them. That's around 950 right there. I have the monthly card so that adds another 350. Wishing tree is 105. Assuming I have terrible luck (I do) and only get 20 coupons from the "Try your luck" wheel, that's about 140. I don't count the group wheel, that's just bonus to me because the odds seem terrible.

So overall on a normal week? About 1545. Plunder is by far the biggest source of coupon income.