The problem is that high-end clients would want somebody with stability, resources, and above all HISTORY.

There are too many people who setup hosting companies because it is comparatively cheap to get started; buy a box, fill it, buy another.

But doing it right involves having spare hardware, on-site access to pull out failed drives etc, etc. If you're one person and you have a single machine then I can't even rent two guests/machines from you and do load-balancing which rules you out entirely.