Mouses with double click buttons? LoL! :-D I am aware, though, that there is now a myriad of computer mice with all sorts of programmable stuff in their plentiful button sets.
The earnings of a round always need to be claimed for them to turn into a coupon. No claim means no coupon and 0 earnings, cannot stack them.
Hit that link of yours above thulfiqar, for some reason the auto-clicking thing stalled by the end and got only €0.28. Something is something, though. ¯\_(ツ)_/¯
Game earnings only go to game link “shareholders” if a round is active. Once you claim a round's earnings by redeeming a coupon, that is finished. If you follow an old shared link you can play the game (they last up to a month), but your earnings go nowhere. So don't use old links thulfiqar, this is the reason we and others actively edit our threads to remove the shared links once done.
Where did thulfiqar went? Well never mind really, I'm not sure if I need to beef up another coupon right now, they are valid for a maximum of 3 days anyway.