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Typically, for "legit" businesses, it is part of the SEO team's job. The girl we used to have would spend maybe 30 minutes in the morning linking on comments on related blogs, post to facebook/twitter/pinterest/etc, check on keywords, update budget for our Google Adwords and then move on to actual copywriting and research. If you do it enough I guess you can do it in your sleep. Dead links with awful copy, etc is probably something like Mechanical Turk or Fivrr though. For those it is literally pennies.Sometimes there are real folks dropping links in forums. They must get payed pennies per hour. It's awful.