Personally I dont think a site should get a boost for having 200 links from 1 other domain – after a certain number they should stop counting. Say more than half a dozen links from 1 site to another would indicate some sort of linking scheme with the intent of boosting PR and rankings.
If google is going after this type of activity Id have no problem with it. I witnessed a site several months back pull this off with great success. The famous .md sites had a linking scheme between several of their sites – they linked to every other site on every single page. It appeared as if they had thousands of links, until you seen they were all coming from each other.
In my book thats crap and of no use to the average surfer who is actually looking for information.
Also Ive seen sites out their that are exchanging 20,30, or more links on their homepage – why do they do this? In hopes of getting a higher PR boost. This is a linking scheme and should be frowned upon.
This is something I believe google can easily pick up on. Im sure they must have a trigger mechanism E.G. a number that is acceptable. Furthermore Im sure they will begin enforcing this some time soon.