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Whilst I can see that they may not want to effectively assist one of their competitors, is there any real reason for them not to give me this information.
Sounds like you've hit the nail on the head there - this list of IP addresses is something of value to their business model which they believe will give them an edge over their competitors because their PPC results will contain less fraudulent clicks, which by extension equals happier customers.
While they think this is true there's not a hope in hell that they'll release this information for public (or competitor) consumption as they probably believe its one of their USPs and so will guard it like their profits depended on it.
Also as long as they keep this information private there can be no claims of defamation from people using the affected IPs (bearing in mind that the list amounts to < X > is a known fraudulent clicker) - also the fraudsters can't use this data to work out which systems are already flagged and/or which of their techniques actually work.
We are entering the PPC field with a (pure) meta approach. We have enlisted many of the 2nd/3rd tier engines, but are too small at this point to interest the big boys.
Would you care to say which engine is using the IP blocking list? If we do not already use them, we would like to. An ethical PPC always makes a good addition!