Water in Outer Space

On Earth, water is considered by many to be vital for life to begin. Now water vapour has been detected for the first time in the atmosphere of a planet outside our Solar System. The planet, HD 209458b (why can't scientist come out with some better names), is a Jupiter-like gas giant located 150 light-years from Earth.

Question is why they are so surprised to find water or water vapour on other planets? I mean there are billions of planets out there, surely at least one other planet out there have a lifeform or at least water. I mean what are the odds of we being the only planet that have life? I think I have a better chance of hitting TOTO!