As I ask in title is this true? Is possible when I have one site with 100 pages with PR3,4 to sell one link in each page for 3-5 $ per month?
how much you will get from a link sell edpends not only based on your PR but also based on the quality of that site. 3-5 on a pr3/pr4 sitewide seems reasonable
Yes, future is in non-sitewide links. In next 6 months sitewide links will be dead because nobody will sell them - everybody will be selling links on individual pages.
It sounds good no? If you have one site with many good PR pages you can earn much money. It´s the same when you sell one sitewide link for example 10$ now you can sell links on many pages for 10$
you will not be able to sell each link on each page for $10 just because nobody will buy them. But, you will be able to sell each link on each page for $0.1-0.4 and there will be plenty of advertisers to choose from and total income from the site that has many pages with pr will be 3-10 times higher in comparison to selling sitewide links.