Thank you for your participation in one of our biggest giant threads, Mojo!
With a real spammer (man or woman) you can make some agreement (we had some situations here already) and you can have some mutual benefits: he/she posts his/her links, but also posts fresh, unique for your site. Fair enough and some websites (for example the blogs) use this win-win strategy.But with the spambots you can't make any communication and they're practically useless for the website, so the real anti-spam fight should be with them. I think over here the 90-99% of the spam and/or duplicate accounts are generated by bots and we deal with them.Maybe some of our guests/readers didn't get me. I'll show a fictional example:
Mr. X works for a SEO company and he is paid something like $ 0.20 per link. He targets a website, where he needs to link 3 times with a few keywords. The owner of the site may get something useful, if Mr. X contribute 3 unique articles, not only 3 links. If Mr. X only post his links, the owner probably will delete them. No win-win game. But, if the owner set a rule like: "links are welcome, but only if you contribute for me quality content", then Mr.X will get his $ 0.60 and the owner probably will earn something in the future (from ads, from selling the website, etc.)
If the X-bot is posting links, even when it provides some article/articles, it'll be not unique, it will be duplicated content, which isn't useful for any website. The owners can't talk to the bots to contribute something of real quality, so using bots doesn't make very good sense.
What is really ironic about it, is that I would never click on a spammer's post link.
Many of them don't need it. Their links are not for direct traffic (visitors), they are for optimization of their position in the SERP: if you have a quality linkbuilding (your links are in related threads in trusted websites) Google, Bing, Yahoo and others will show up your website in the top positions. And this is already the real big traffic. Imagine, if you rank number 1 for words like 'insurance', 'lawyer', 'money' or 'pizza', what great traffic is coming to your website and (if you have good ways to monetize it) what income is going to your wallet.
There is market for this (I'm not going to give it free ad, so I don't point to any website that provides this services). It's simple: Miss X wants a link with keyword 'jewelry' and pays USD 5 for it. Mr. Y has a related website (about silver rings, golden earrings, jewels, etc.) and creates the necessary link for Miss X... and gets USD 5. This is how it works.
Links for clicking (i.e. with primary goal to receive serious amount of visitors) are usually posted in websites with 'tons of visitors' as Facebook, Twitter, Reddit and around 5000 others.