Key Fragments

OK, so I realize that riot is giving free skins and ward skins in their new update with the hex-tech keys and boxes and it is very wonderful. My issue is that I have opened about 7 boxes and 4 of them only contained champion shards which to me is completely useless since you can just buy the champions with IP. Then I got 1 decent skin for a champion i don't own and finally 2 ward skins. I currently have 5 hextech boxes that I cannot open because I cannot collect enough key fragments to open them. I have been attempting to farm keys by winning and winning the last 5 games in a row failed to give me a single key fragment. So sure riot is giving out free skins (sometimes) but it seems to me that this whole system is mostly rigged to get people to buy keys from the store. In the shop you are able to buy chest in bundles and they come with keys but there is no option of buying a bundle of keys. This prevents people from being able to open all of the boxes that they have stacked up since every game you win it would prefer to give you a box instead of a key fragment. So if you did wish to buy all of the keys you would have to buy each on individually. I just wish that riot would change this system a little bit it seems so random sometimes and it is very frustrating. Sometimes you will be in a game carrying your whole team and be like 21/5/15 and you will get a A or a B ranking while someone on your team who is playing will have a score of 9/2/3 and they will get an S rank. So while the system that ranks how well you did in a match must run off of many variables sometimes it seems almost random why it would decide to get someone and A instead of an S or even C over an A etc. Basically it is really easy to get the chest but farming keys is impossible. While i realize most people are like "OMG MAN RIOT IS GIVING FREE STUFF STFU QUIT BITCHING" - nerd
I feel like this system is seriously insane and they should adjust it a little bit