Receptional_Andy - 9:48 am on Dec 22, 2011 (gmt 0)

You're likely to get a better respnse to your question over here:

[webmasterworld.com...]

There are a few different price structures out there, but for a client it comes down to what sort of return they will see on your spend. If the ROI adds up, then how you decide on pricing isn't really important!