That with SN frags maybe its your luck really... i got 1 SN frag per day per 5 keys.. As for advance refines it droped 30 percent so i was like hell with the 40 and bought a lot of them ... still spending 1k on keys its a bad choice. As far as i know.. if you still have keys left... use them on the last day. My groupmate uses all 35 keys at the end of the week and he gets like 6-10 SN frags.. every time he does this...