It should be pretty tough. Even more so if they're using full hardware virtualization. It may be possible from time to time to exploit bugs in the virtualization software (xen, vmware, virtualbox) to gain root access to the entire virtualization package but these are probably going to be few and far between and vps's in nature are far more secure than being on a shared web server (assuming secure up to date webservers in both cases)
Besides, most hacks I've seen tend to be on out of date wordpress installs or other outdated scripts.
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It's like I was born slow or something. Mock me if you will; I finally got
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