I appreciate your point that some products are really not SaaS-oriented, yet try to be.
But your two examples here seem exactly the kind of long-term customer relationships that benefits from SaaS. And may in fact be underutilized. These are high-touch, deep background kind of gigs, rather than impersonal service sites. I want to have an ongoing conversation about my task and I'm willing to pay a retainer++ for that privilege.
http://www.thedigitaldesignco.com/graphic-design-subscriptio...
not exactly just logos but people seem to try and SaaSify everything.