Email marketing is hard, and finding the proper prospect at your target companies is the best way to make it easier on you. No more guessing someone's email address, begging "please forward this to the appropriate person" or ending up in a general inbox. This is a snipering tool, not a shotgun.
Since you're reaching out to the right decision maker for your pitch, you're way more likely to actually close them. WhoWorksThere will pay for itself in no time.
When you're buying or scraping leads, you only get a few people at the company, and they're often not the department you want. WhoWorksThere lets you pick the people you want to market to from a list of all employees.
Since we give you a verified email address, you'll see almost no emails bounce back to you, unlike those leads you bought or scraped, which are who knows how old at this point.
And since you're bouncing less emails back to you, your cold email campaigns will function better technically overall, and you won't have to be scared of winding up in the spam folder.