So for my understanding, let me re-state how I read your offer.
1. If I choose a PR-5 website for a blogroll link, I pay $20 and you place the link on the blogroll of your website over the whole site (all pages).
2. If I choose an inner page link, I pay you $52 and you make 4 posts on 4 inner pages belonging to 3 different sites, 1 site's inner page on which the post appears being PR-2 and 2 other sites' 3 inner pages on which the posts appear all being PR-3.
Is that right?