Alright, just lost a fat chunk on a proxy pool I built myself. Thought I was clever tossing together some cheap residentials, but turns out half the IPs are dead or worse, slow as molasses. You think you're saving a few bucks but end up burning more on failed campaigns, reruns, and constant maintenance. Building your own proxy pool sounds sweet in theory, but man, the quality control is a nightmare. Don't get fooled by flashy providers that promise 'premium' IPs, most of them are just recycled junk. If you wanna actually make this work, you gotta vet each IP, rotate smart, and keep a close eye on speed and success rate. Otherwise, you're just throwing darts blindfolded and wondering why your EPC is trash.