Now see, this is something that web hosts are well protected against in their Terms of Service. They promise unlimited resources in terms of disk space and bandwidth. Once a site starts to consume a lot, or create a higher load on CPU, they will cancel the account (which, I guess, is the point of your scripts).

However, is there a way that would test their promise of unlimited resources (space/bandwidth) without overloading the CPU? For example, something that will continuously download something off your site?