Why google does not show all back links?

SlickR, I appreciate your knowledge..However the a point which you call "Fact" i.e

Accroding to this a sitemap is a link farm .. just kidding.. but like I proved you above, google does shows the backlinks from such pages which have even more than 50 links..I randomly looked at the backlinks of a site.. I will be glad if you could too prove the *Fact* that pages with 30+ links are not counted..?

Like I said, Every link has a value, It cannot be zero.. even a link from a link farm has got some value greater then ZERO, may be say 0.1 but it cant be negative or 0.. a relevant good PR link can have a value of say 10..but every link does has its own value, no matter where it comes from..

I completely agree that NOW A DAYS paid links and directories have to bear the flames..but according to the OP, the question is about links being shown with the link:command

lol.. Not boasting, but I might be like a new member here.. but quiet old at SEOChat forums.. and I dont like to run after PR.. I love SERPS and only SERPS

Regarding Improvement of PR, PR can be gained with any kind of links.. ANY TYPES of links would be ok to inflate PR as long as they are followed.. no matter relevant or irrelevant.. I dont wanna spread blackhat here.. but those who know abt it can easily judge as to what I am talking about

But in the end, I agree with you on this point in a general manner, not considering OP's question

Good Point! everyone shud take a note of this..

 

I think it would be to noticeable and easy to understand Google algo, if they show links that are important.

 

This is a great thread, I learned from it a lot. Thanks!