Really? "The system is affecting the game’s economy negatively"? You have added two new turrets, a bunch of new paints, a lot of micro upgrades to almost everything in garage, and all of this without changing the way of getting crystals in game. I'm sure that everyone loved these daily missions update, but lowering the rewards to "force" us buy crystals to follow the new items that you release it's kind of appellative in my opinion... But here's a tip to get better: if you think that the missions are too easy, why don't you increase the difficult of it (to a certain extent) instead of lowering the rewards? It could take more time to we finish a mission (I mean at most all day), but at least it will worth it. I see these daily rewards as a way to attract that players who were inactive or just entered to collect the daily bonus and then logged out (as I was). If that's the case, you will hardly do this with these rewards. I'm not talking as a specialist, i'm just letting of steam and giving you a suggestion. I'm also not disagreeing of the daily missions (in my opinion it was a greatest step on Tanki for those who doesn't buy crystals), I just don't agree with this changing (that though it may be temporary, I hardly believe that you'll back down).
Anyway, I'll wait this experience stage finish and hope for the best.