You did say you were working on a "Pharma" site right? What other types of viagra sites exist besides spam sites?...
Kidding aside, sites may rank in spite of their poor link profiles. Links are not everything. They are a lot, but not everything. If the sites are old enough and perform well enough, their history may outweigh the updates. If you don't want to follow the crowd then better for you. Your very own diversified link portfolio is better than trying to match another site's. Go for links a spam site can't get. Get quality Edu links. Put out quality content. Go for long tail search and rankings. Watch your site slowly pick up speed. It's a slow road, but has sure footing.
Or follow the crowd and go for that automated link building. Just remember, if you want a quick road to the top then you can expect a rapid decent as well.
Disclaimer, either approach could fail, either could win. Know your risks.