The motive is unclear because attacking, for example, root servers, is an effort without some obvious economic incentive
Since when is advertising NOT a sign of an obvious economic incentive?
The DA report went through a large thread(s) to post statistics here and I'm not sure why yours will be any better, or, just another set of statistics which further de-sensitizes everyone to the problem.
Stats by themselves can be boring. But making data available regularly and publicly will inevitably lead to some people doing analyses of this data and presenting those analyses to NANOG meetings. This will lead to wider understanding of what is going on and will provide raw material for getting management support for actions to solve the problem. --Michael Dillon