The likely answer is to do with audience biases. A survey conducted by an email marketing provider is almost certainly going to have different results to one conducted by PPC management tool, as their audiences have different skillsets and biases, skewing the results of their sample. As such, we should take the specific ranking of different strategies in these studies with a pinch of salt.
Each lead generation technique usually has a tradeoff between quality and quantity. For example, a form on the company website that visitors can fill in to request a call back will generate high-quality leads – these visitors are very likely to buy since they're interested enough to want to hear more – but probably won't generate a lot of leads. On the other hand, a lead list that's based on a newsletter subscription list from another company may generate a lot of leads, but they won't be nearly as interested or qualified.
LeadsOnline is a national online investigative system used by more than 3,000 law enforcement agencies to recover stolen property and solve crimes. Each day, millions of items are added to the LeadsOnline database by businesses including second-hand stores, scrap metal recyclers, pawnshops, and Internet drop-off stores across all 50 states. Those records are instantly available to law enforcement agencies, meaning crimes can be solved in seconds, not months. The LeadsOnline system, compatible with the NCIC, serves as an indispensible, efficient, and money-saving resource for detectives because it provides a cross-jurisdictional, instantaneous, and accurate database that stops criminals from escaping detection by selling stolen items in another city. An official eBay partner, LeadsOnline helps prevent illegal transactions on the eBay website by giving law enforcement access to the world’s largest online marketplace through automatic upload of all eBay transactions into the LeadsOnline database. LeadsOnline also includes LeadsOnlabs, a system for tracking those involved in the illegal manufacture of methamphetamines; a Metal Theft Investigation System designed to track copper and other metal thefts; and cross-checks names of pawn customers against the OFAC SDN list of known terrorists and narcotics traffickers.
Each lead generation technique usually has a tradeoff between quality and quantity. For example, a form on the company website that visitors can fill in to request a call back will generate high-quality leads – these visitors are very likely to buy since they're interested enough to want to hear more – but probably won't generate a lot of leads. On the other hand, a lead list that's based on a newsletter subscription list from another company may generate a lot of leads, but they won't be nearly as interested or qualified.
At the other end of the spectrum is buying leads. This is also not the best option since it can be very expensive and may result in leads that may not actually be interested in your products or business. These are not great leads, either. The best leads will always be the ones you generate yourself—people who have shown some sort of interest in what you have to offer.

Great article and you nailed it regarding purchasing leads. I tried a few times talking with various people over the phone but none committed. I often wonder how the greats like Dexter Yager and Bill Britt (both amway reps) built their businesses to such a large magnitude without the use of social media. I certainly believe social media has made building network marketing businesses much easier than back in the day.
Lead management is a combination of several things. First you need the right tool to store your leads. There’s no point generating a torrent of leads if you can’t view them all, with context, in one place. And then you need to nurture every lead before they can be convinced about doing business with you. Finally, you’ve got to be able to rank your leads—based on how much (or how little) they engage with your business—so you can reach out to the hottest leads first.
ii)  Give value before asking for anything: Whether you’re hosting a webinar, writing a blog post or speaking at an event, you have to offer tangible help before asking for the sale or any other thing that would require the attendee to move out of their comfort zone (e.g., purchase your product). This how to draw in your potential customer – and, hopefully, keep them. 
Cost per thousand (e.g. CPM Group, Advertising.com), also known as cost per mille (CPM), uses pricing models that charge advertisers for impressions — i.e. the number of times people view an advertisement. Display advertising is commonly sold on a CPM pricing model. The problem with CPM advertising is that advertisers are charged even if the target audience does not click on (or even view) the advertisement.
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