You're more than welcome to self-promote, but I don't see much difference between what you offer and what, for example, Hetzner offers.
They are offering better webspace and data transfer by the looks of it. We offer unlimited features where they don't as well as a telephone support offering. We also offer free setup on everything.
In terms of VPS comparison we offer unmetered transfer on all packages and a bit more flexibility in terms of customisation.
We can do even cheaper VPS servers also in Europe and US on request, starting from £6/month for a 1 core, 512MB RAM 20GB SSD with unmetered transfer.
So self managed is out. As for shared, above a certain level which both you and Hetzner exceed, more capacity is irrelevant. What really matters is great support and rock solid performance and reliability. If that's on the table then I'd happily get my clients to pay 2 to 3 x what you charge.