I must admit that my experience does not support any claim that Bluehost is suitable for autoblogging. My account was suspended because I was using Reviewazon and Associate-O-Matic.
Hostgator have suspended my sites two times due to a high load of running processes and that's only with 5 sites (baby package) and with W3 Total Cache installed.
Ok, one site had over 10 000 visitors a day in the last few days but still. If you plan to have 10+ sites and a total of 10 000 visitors / day (combined) i wouldn't recommend hostgator.