These types of lands are at the base of every multicolored magic deck in eternal formats/modern, the only way to avoid them is playing mono-colored decks, or taking either a heavy tempo hit or making the mana base unstable.

They are a good addition to MTG, because they mitigate the luck factor involved in getting the right mana in multicolored deck and increase the variety of decks.

However the price range from 30€ - 120€ for a single land (I'd say x15 for a normal 3-colored deck) makes them unaffordable for a big part of the community.

I suggest putting them on the next reprint set as uncommons, this shortage has lasted long enough.