Why?

Why do agencies, such a public art galleries invest our (the people's) money in art not worthy of the name.
Today in the Tate I saw nylon tights stuffed with wire and other materials, curved into piles to resemble a shape between a large poo and a Willie twisted around malformed legs, piles of crumpled paper painted in pastel colours, and various paterns and scribbles a dog could have managed. The exhibits scattered around four rooms were proudly hailed as purchased of work by modern artists.
Any self respecting dustman would have carted them away as rubbish.
I wonder how much money was wasted on that lot.
WHY does no one ask US what to buy?
What sort of trip are these people on...