So last month I was trying out some mobile app install CPA stuff, you know those offers with big payouts and high volume. Found this network promising $3 per install, good conversions, landing pages seemed legit. I threw in $200 to test it, targeting popular games and utility apps. In like 24 hours I had 150 installs, got paid out, everything looked awesome. But then I started seeing weird stuff - installs from sketchy sources, fake device IDs, VPN traffic. A week later they flagged me for invalid traffic and just shut my account down, no warning. Basically the whole network was a scam. Ended up wasting $300 on fake installs and got banned from other good networks because of the bad rep. Lesson learned - never believe the hype on those 'guaranteed' high-percentage CPA offers. Always test small first, check your traffic quality, read reviews. The numbers can look perfect but some networks are just playing dirty behind the scenes.