I think PPI isn't dead, but it's definitely not the same business it was 5-10 years ago.
Years ago, almost everyone involved made good money — advertisers, networks, and publishers. Over time the market became much harder because traffic quality declined. More duplicate installs, incentivized users, recycled traffic, bots, and other low-quality sources started appearing. At the same time, browsers, operating systems, and security software became much stricter, making desktop campaigns much harder to scale.
Today, in my opinion, quality matters far more than volume.
I'd rather buy 300 installs from a publisher with a genuine audience than 10,000 cheap installs that generate no retention or post-install activity.
If a publisher is confident in their traffic source, I'm always open to testing it. I usually start with a small test (100-200 installs), analyze the audience quality, retention, and overall performance. If the traffic performs well, I'll gladly pay for the test and continue buying larger volumes on a long-term basis.
I'm mainly interested in traffic from real users with genuine intent, not generic download traffic. Business, productivity, education, finance, or other high-intent audiences are much more valuable for me than pure consumer download traffic.
I think this approach benefits both sides. Publishers with quality traffic get a long-term buyer, and buyers reduce the risk of scaling poor-quality sources.
If anyone here has a quality traffic source and is looking for a long-term buyer rather than a one-time deal, feel free to send me a PM.
I usually start with a small test (100-200 installs). If the quality is there, I'm happy to pay for the test and move to larger volumes.