While my disappointment seems like the perfect argument to support this suggestion, the truth is that the impulse buy is very strong for Riot's business model, and when Riot succeeds, we succeed. Most of the time I'm satisfied with the purchase, but I have been disappointed at least on one occasion. I'm sure I'm not the only one to do this. I've personally purchased several(more than 5 that I can recall) skins during champ select. As a employee of Rito(I very much am not), I would think this would drastically impact the impulse buy margin.
