I'll let my ignorance shine through here...
WTB is "Software as a Service" all about?? Software is applications that run on computing hardware to do a job? The SW may be complicated, pervasive and integrated but it still only helps people to deliver a product or service. In itself, it is not "a Service" is it?
The term "SaaS" sounds very much to me as though it comes from those scoundrels who perpetrated an abuse of the English Language when they re-purposed the word "Technology" to cover any old blx dressed in new, sexy cloths.
I'm a dinosaur so am a bit slow to catch up with these modern trends and vocabulary.