So um, "Your Shop" apparently doesn't give you skins for only your most played champions

I mean, I play all the time almost Riven, especially when I get top but I haven't got ONE skin for her, instead I got for some picks that I take when riven is taked/banned and I play like every 20 matches, heck, even if Vayne is my second highest mastery I haven't played her for months now and i just got a 60% on her. The same with Twisted Fate, I think I played him 2 matches or heck, even one to test if machine gun TF still worked in the jungle and heck no it didn't but yeah, I got the skin for it, same for Twitch, didn't play in one month or so. Really dissapointed. More proof here: http://prntscr.com/f9oop6 http://prntscr.com/f9oq6h

Didn't even get 2 60's, last time I think I got a 70% or so, my first Shop ever was a Nutcracko Shaco on 70%, can't be dissapointed about that and the last time a Battle Bunny Riven at 60% but still, I would've really liked a Dragonblade or Arcade Riven :(.