Agree that the SaaS offerings are a lot more turnkey; the integrations and polish that make all the difference.
What you call a 'clusterfuck' is really a wider ecosystem. It would be pretty crazy for a single organization to use all or even most of the tools that you list.
Right now, people accept high degrees of cost (especially for at scale users) and lock-in, in exchange for the convenience of SaaS. Or, they go open source (which to your point, certainly is an investment in time)
Watch out for what team Grafana will be doing in 2017. Our plan is to provide a fully turnkey, hosted offering based around Grafana (and a handful of other open source tools). OpenSaaS.
We hope that for many users, this can be a third choice, and in some ways the best of both worlds.