I think that whoever started the 2 to 3 times what a site make a month is crazy. If the money is stable (which he is saying it is) He should easily be able to get 6 to 12 months wages for it. I only say this if the money has been stable for awhile. But if you are looking for a quick sale maybe closer to 6
If it is making 1600$ a month...you might want to talk to your sponsor...they might be more interested than other.
What is the site name you are selling?
Deeprub