I think that something should be changed in this system because there is something wrong: actually those who support the game spending 10 ingots run the risk to get plundered and lose their coupons and those who don't support the game are free to get 150 coupons daily.... there is clearly something wrong.

In my opinion will be much better to do in this way:

1) First SS for free and you can be plundered, all other SS missions will cost 10 ingots (as now) but you can't get plundered.

2) First plunder free, all other plunders will cost 10 ingots.

In this way all the players will support the game and everybody will have a chance to get something, those who do convoy, will get 122 or 140 coupons and will spend 30 ingots (always if they are lucky to find 4 SS... it is not that easy) and those who plunder will have the possibility to get 150 coupons using 20 ingots.