Keep in mind that the Marketplace is still relatively early days in the grand scheme of things (still not a year old yet). I remember back in the early days of the Unity marketplace, everything was exactly the same, a lot of high priced items. The UE Marketplace hasnt gotten to a point where there is a lot of competing products so prices will be “high” (though relatively speaking, they are quite low).
Give it time and you will begin to see people that think they can release a similar package that may have more features than a competing one and they will do it for cheaper.