Camera Lenses

Why do they have to cost sooo much money? I went into a camera store this weekend to test a couple on my camera.

This is the fisheye - isn't it cool? Too bad you can't really get one of these babies for under $500!

And this one is taken with a Sigma 10-20 mm wide angle lens...now I can get this one for around $400, which isn't bad. Still thinking about it...although I may save my money until I can purchase the fish eye.