Oh boy, I know people with a fiber drop, 25tb raids with baby server farms and single character password. I think you highly underestimate the lazyness and/or stupidity of people. That doesn't even cover fishing.

Secondly, I think you underestimate the time intensive work that goes into clearing up an IP. I've run mail servers with users in the thousands. It's basically a full time job to keep a single ip clean. And that's with a half or less percentage of clueless users. I'm unsure how this will scale to hundreds of IPs let alone the thousands(x100) that would probably be needed to make creating your own hardware profitable.

Third, you're going to need to reach incompetent customers to make this profitable.