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As well as other things like its value.....on average how much does a web page cost i.e. if a web site costs £100 and 100 people view it then in theory it has cost me £1 for every person to view it.
Or any other stat sites such as this.
Yup, expect to pay at least £1500 (~ $2000) for commercial grade information.
I've looked at this in the past, and it nearly gave me heart failure. Having said that, if you've got one or more big commercial clients, its a good investment, that sort of information could take you months to collect and interpret from your own sources (even assuming you have the tools and skills to do so). I would still only treat it as a good guide though.
Your own server logs can be the best source of information you have, because all the information is related directly to you.
i.e. if a web site costs £100 and 100 people view it then in theory it has cost me £1 for every person to view it.
I think this is a narrowsighted view. First of all, you're thinking in very small numbers, but for the sake of simplicity...
If a website costs you £100 and 100 people view it, you can see it as meaning it was £1 per person, except that you're not paying a developer to bring you visitors, you're paying him to make the product (which includes, in part of it's design, natural mechanisms for building traffic).
Also, as the months go by, you'll get repeat users and new users (if it's updated) so that £100 you spent dilutes. So in the first month, if you get 100 users, that's £1 per user. In the next month, if you get another 100 users, that dilutes to £0.5 per user, then £0.25 the next month, etc. etc.
When you're paying for marketing services such as SEO or banner ads or something like that, that's when these kind of ROI (Return On Investment) statistics come in handy.
When you're attempting to figure out the worth of a site if you're having it made, you value it by looking at market prices for the creation of other sites with the same features. If someone else paid less than you did for a site that's noticeably better, then you can induce that you over-invested in that site.