i use Hostgator, and i have had no problems not sure how much traffic "serious traffic" would be though.
7b.) INODES
The use of more than 250,000 inodes on any shared account may potentially result in a warning first, and if no action is taken future suspension. Accounts found to be exceeding the 100,000 inode limit will automatically be removed from our backup system to avoid over-usage, however databases will still be backed up. Every file (a webpage, image file, email, etc) on your account uses up 1 inode.
8.) Bandwidth Usage
You are allocated a monthly bandwidth allowance. This allowance varies depending on the hosting package you purchase. Should your account pass the allocated amount we reserve the right to suspend the account until the start of the next allocation, suspend the account until more bandwidth is purchased at an additional fee, suspend the account until you upgrade to a higher level of package, terminate the account and/or charge you an additional fee for the overages. Unused transfer in one month cannot be carried over to the next month.