> They'll yell and threaten when you tell them that this is outside the scope of what you can do.
They will, and you will tell them to leave. Unmanaged VPS' are unmanaged.
> Those pwned customers are complaining and demanding that you fix it
Tell them to leave, they are paying $5/mo after all.
> regular customers are also upset because of slowness due to the "noisy neighbor" problem inherent to all VPSes
Throttle abusive users, and hand-wave it via AUP, TOS, etc.
> neither gives you great tools for dealing with disk bandwidth
That could, should and will be fixed sometime.
And we have no idea if a similar action by Vultr is imminent (I'm not saying it is -- but we don't know).