I got this email recently:
Subj:
Your account is going to be suspended soon due to resources overuse
This is automatic report. Do not respond to this email.
Your account "XXXXXXXX" (domain name XXXXXXXXXXXXX) is found in violating our 10% resource usage policy described in http://www.justhost.com/terms-and-conditions
According to our system-logs your daily average usage is as follows:
CPU = 5 %
RAM = 20 %
MySQL = 0 %
Just Host offers unlimited hosting space and unlimited bandwidth, but as per our terms we will suspend any website which exceeds our 10% CPU policy.
Please visit this link to upgrade to a dedicated server: http://www.justhost.com/godedicated. Sorry for any inconvenience, and we hope you understand our decision.
The subject of this email might as well be "We think you are an idiot and will signup for more expensive option after you read this". I'm switching to another host.