Here is my coupon income being F2P (this excludes coupons obtained from events).

Daily income: 50 from plunder, 35 from convoy, average 40 from group wheel (10 from being online for 1 hour but I use 10 for stealing mines, so not counted).

Weekly: 80 from group summon

Total :

50 + 35 + 40 = 125 daily coupon income

125 * 7 = 875 for the whole week with daily income

875 + 80 = 955 total for the whole week