Apples and oranges, really. You ignore the basic fundamentals of the market - the supply and demand. Right now, everyone and his aunt is on the hunt for guest posts. Even my worse PBNs receive several e-mails per month asking for guest posts. Also you somehow assume that webmasters receive "quality content that increase authority". This is naive. In 9 out of 10 cases they get $3.5 content from HireWriters and article with title like "Best dumpsters in San Diego". YOU may promise them really high quality content, true, but after hearing this at least a dozen time, no one will believe you, nor care enough to actually read your content, if you did not pay. Comparing pro bono work with post that actually will monetary benefit you is crazy. Lawyers work pro bono to fix injustice. not to enrich their clients, you know? Wikipedia is non profit website, that have a cause and ridiculously rich sponsors. Comparing that to your average webmasters is nonsense.
No, not everyone and his aunt is on the hunt for guest posts. You are greatly over exaggerating the demand. I have hundreds of blogs and literally have never had a single request for a guest post. I am definitely willing to call you a liar if you say your worst PBN's receive several emails per month asking for guest posts.
It's irrelevant whether or not the webmasters actually receive quality content. They don't have to publish articles they are given. They tell the person to send an article over. If it's trash, they don't post it, or they can then ask for a fee if they are willing to sell out. If it's high quality they post it. They aren't required to post something just because they agree to it. They can just tell the person "this is trash, give me money or it's not going up."
Your argument is now that webmasters are lazy and are willing to risk missing out on good free content rather than spend 2 minutes reviewing an article unless they are guaranteed compensation at the full posting rate. If that's your argument, fine, I am not here to argue that webmasters aren't lazy, I am asking WHY they are refusing good content. You really don't seem to understand that. I am not saying it doesn't happen, I am saying that if you reject all free guest posts and demand money from everyone, you are probably a stupid webmaster who doesn't know how to run your website optimally.
Guest posts do NOT automatically provide a monetary benefit. There is NO difference between them and pro-bono work. Guest posts build your authority and possibly bring you new traffic. They can't make you money. That's literally impossible unless someone else is paying YOU to secure a guest post on that site. Some lawyers work pro bono to fix injustice. Some lawyers work pro bono to improve the image of their firm. Some lawyers work pro bono to get their personal name out there. Some lawyers work pro bono to help a friend or family member out. There are many reasons to work pro bono.
Wikipedia chooses to be a non-profit website. Wikipedia could become an extremely profitable website if they decided to. The average webmaster who demands money for every guest post will never become an authority website like Wikipedia. That's my entire point. If your average webmaster thinks they deserve money from everyone willing to provide free content, they are stupid people who are limiting their websites potential. Content is king in the world of websites. Demanding money for every guest post is short sighted. You are clearly short sighted by supporting it as a reasonable practice.
I will trust these guys as authorities over your PBNs.
https://www.businessinsider.com/contribute-to-business-insider
https://www.huffpost.com/entry/how-...sonal_n_5a5e0726e4b0fcbc3a1388f0?guccounter=1
https://www.theguardian.com/careers/guardian-careers-guidelines-for-contributors-and-writers
https://www.psychologytoday.com/intl/writers-guidelines
https://www.fastcompany.com/3008467...icles-fast-company-and-tips-getting-published
That's just a very small list of some of the biggest authority websites which accept guest posts with no money exchanged on either side, just high quality content published to benefit the website and the writer. Of course, there are many successful websites who don't accept guest posts, but they also don't charge for guest posts. They PAY people to write for them. If you want to become an authority website and you don't have the money or connections to fund unlimited quality content on your own, you HAVE to be willing to accept free quality content.