Thanks Andrew. I've read the guidelines and the T&Cs and I read that, but it doesn't answer the question - in fact it falls so far short of answering the question that the gaping hole is the reason I asked the question here. Surely, in a roomful of developers, someone must have faced the problem before and knows the answer.
I'm not a developer by day - I've written an app that I use in my job, and is downloaded and used by others like me. Surely, during the day, when I'm working rather than developing, I (and Google) should consider myself a user rather than a developer. A user who needs to be mindful of the ethics of needlessly clicking on the ads, but a user all the same!
I guess, though that the situation may be unique enough that Google doesn't care to cater for it. The only reason I care is that it is a PITA to keep on top of ensuring every device I use is listed as a test device, expecially the ones I've rooted and try out different firmware on - each time you do that, the device ID changes and my code has to be changed to include the new ID.
If you need to delete this thread because it's not strictly technical, feel free.
Best Regards,
Richard.