Why does Xara add layers when you import clipart into it?

I rarely use clipart, but was doing a project where I imported quite a few of them. Well! each one I imported had a:
1. A new layer
2. Desktop layer
3. Guide layer
4. Grid layer

It was extremely irritating when went to draw an object which I wanted to be on top of one of the clipart objects only to find it was behind by 30 or more layers.

Does the creation of all there new layers serve a good purpose?

Judi