Non-direct linking schemes advantages?
 

Hi everybody,
When I was surfing and looking for new hard link exchanges I find the following linking scheme
site A(PR4) -> site B (PR4) ->site C (PR?)

is more prefered by the owner of 'site B' then direct link exchange A<->B

How do you think guys what is advandates of such linking (if I understand PR formula well - there shoudn't be any difference for B). So where is a catch?

Alfa

Well, in theory pure recip links are devalued by google.

And 'one way' or non recip links are seen as more natural, and therefore as likely to have more value.

In practice, a mix of recip and non recip is probably optimum. The question is, what number of each is ideal? Since recip links are traditional and still a standard in many situations, that makes each non-recip link particularly valuable, to balance out all the other recip links.