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As the above title says, I think that riot need to bring in more ways to spend your ip. certainly many people still have champions and runes that they are yet to buy, but at the moment, I've got 45000 ip with every champion and hundreads of runes (everything i see necessary). additionally, I seem to work up more than 6300 ip every time a new champ is released- so it isn't changing. Also, I own 20 rune pages.
I sure many other players are having the same problem as I am.
Possibly an ip to rp converter (have no idea what ratios)
Or badges/summoner icons.
I'm not really that sure of what else could be done, but I'd like some alternative ideas and maybe riot to identify the problem?