It's harder to rank high in the SERP with a lot of links. About 10 days ago, I started 2 sites at the same time. One (site A) I blast scrapebox links directly to it the other one (site B) I didn't. Site A has 1500+ links within 3 days and site B only has about 70 links right now. Site B has PR 5 - PR 9 D0-Follow backlinks. On day 7, site B got on #14 for the same keyword that site A has. And site A was no where to be found.
That is to tell me that I need to focus more on high quality links. So I set up more of those and then blast scrapebox comments to those high PR pages just to sort of get a link pyramid going.