It's basic economics. This is a strategy that will make Riot a lot more money than if they sold it separately. If riot can't sell any of it though, they won't do it in the future.
Exercise your most basic consumer right and just don't buy it. NOT buying things is what puts consumers in control of the economy, you really don't need to buy an icon you'll use for 2 months at a ridiculously inflated price. Once you do, they'll keep putting them out at inflated prices because it's just that much more profitable. Riot is making more money, that's their job. If you don't like it, than do the best thing you possibly can do about it: Nothing.