If you got them already and you got a ranking boost, you would know how powerful they may be. If you cannot get your pages to move up on serps with these links, they I doubt they would carry much weight. Do the pages have PR at all?
The more, the better to make it look like a real site managed by real people. They may or may not be enough depending upon your keyword competition, but yes, you need diverse backlinks too. Get links from as many different sources as you can to be on the safe side.
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