This is completely wrong way to view SaaS. It's just about making money, the control part is just so they can try and squeeze more money out of you. Control is not the goal. Money is.
Saas seems a lot more predatory and risky than most products/services. You hand over money, you hand over control, you hand over your data and all of it leaves you varying degrees of vulnerable.
I guess I shouldn't expect a pragmatic view of saas to be popular around here (some of you are likely working on your own saas projects after all), but the reasons saas is attractive for companies to offer are the same reasons that make me hesitate to use them.