It think the point of the article is that with SaaS, the customer invariably end up spending more than she really wanted vs purchased locally-hosted software.

It think the point of the article is that with SaaS, the customer invariably end up spending more than she really wanted vs purchased locally-hosted software. Which is a big reason why there is so much SaaS in the first place, in both the consumer and professional world: the customer _forgets_ about this recurring cost.