I've noticed that after the two weeks of spacetime, when you actually have the matches among top128, you don't get anymore the spacetime currency. I suggest to continue to send them also during that week, at least for people that didn't make it for top128 and for people that got kicked out of it before the beginning of the following season as a consolation reward. Something like 200 currency per day for people outside top128 and 400 for people in top128, otherwise that shop that refreshes every day during the strongest combat week is totally useless.