My Kontera trial, which lasted about two weeks, was a good example of
Testing to Failure. It didn't work out, but I'm glad to know it didn't work because of actual field testing.
Even though I consider the test a failure, it still brought in about $1200 in additional revenue. In the long run it probably would have added about $2500/month, but I agree the ads were too invasive for it to be practical.