SOA on Cloud

In today's world of Cloud computing, I would like to make a case for SOA on Cloud. It make sense for providing an agile and scalable infrastructure. SOA on Cloud would bring the setup cost of the customers down. Recently I had a discussions with a large consulting company engaged in providing SOA consultancy and Syetem integration to large enterprises. The executives really liked the idea of SOA on Cloud. That would immediately bring their cost down. In their opinion, at each client they spend 2-3 weeks in getting environment procured, set up etc before they could start SOA setup. With SOA on the cloud, they can immediately avoid all the setup time and start doing the real work. Obviously the saved time is a saving on billable hours.