Instead of voicing my opinions on this, im just going to say I agree with everything Robin has said.
a personal example would be, a few years ago I found a spider female I REALLY wanted. her price was $1500. at the time, average spider cost was $1000. I was so impressed with the animal and wanted her so bad, I didnt even ask if the breeder would go lower. I just gave him what she was listed for, period. Im not saying asking for a lower price should be frowned upon. but I personally thought this snake was well worth the extra $500... countless people on forums laughed at me and called me a tool. but.. in the end.. im still smiling :]