Persistance of effort is certainly a key in the search for intellegent life. While the likelihood of finding an interesting signal is small for this year it greatly improves over time. Compare SETI to the annual revnue and tangeble results of the movie or video game industry. Why not kick in at least the price of a movie ticket or game app? We can't win if you don't pay. Economically we are talking about a small fraction of the budget of a single hollywood production. Arguments that we can't afford this effort as a society are seriously laughable. An interuption in the SETI instutue effort would not be at all logical despite "limited resources." I am cyical about nearly everything. I still believe strongly that a continued and refining effort is likely to find an interesting signal at some point and from this invalueable lessons will be learned. We can't really determine the probability since we don't know how many signals there are in our space-time neigborhood but we will never know the answer to that if we don't look.