seeker said:it really depends.
if it is a good name earning ppc, is it a website with income ...etc...
assuming it is a site, I would use this (and it does vary, so use it flexibly).
domain name price premium (if it applies for a good domain)+site worth in strict terms (development cost)+traffic, and then add 3-5 years of income for a total price.
This is a key factor ...it depends on the nature of the traffic, the industry of the target audience.
current revenue and of cause how long will the revenue keep coming in.