TidalWave has a valid, but quite crass point: Most people who pay for Virtual Hosting are either just starting out, or are incredibly frugal. They also expect you to offer or install server-wide custom extensions so they can run their Tube scripts, etc, even though this may cause issues for other people on the same server.
If you're looking for primarily small fry Virtual/CPanel/etc hosts, they're a dime a dozen, and you can buy (and generally migrate them) fairly easily. With CPanel you can even just do an export. You'll still need someone fairly familiar with the systems, and is capable of not only importing the data through the panel system, but fixing/manually importing SQL, maintaining DNS, bribing the current block holder to forward the old IPs to the new nameserver if you don't own IP space, updating all of the zones, etc...
It's essentially an enormous headache, and consolidation of virtualhosts tends to cause many more issues than just having someone on call in the area to handle any hardware issues.. however, then you have a major split horizon among all of your hosting, which can become quite unwieldy.
As far as support, there's always BobCares, which isn't the best, or brightest, but they can assist during 'normal sleep hours' if you do not want to maintain a staff.
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