LOL.  Yep, as stated above, Imageshack and Photobucket work wonders.  
Basically, I have the server space for my own sites.  There are currently 3 sites on it, with a fourth to come.  Only one is truly "MINE".  I pay about $100 a year and get unlimited space and bandwidth.  I also have unlimited emails, anti-spam, SSL, paypal, and support for any other features I may need.  So the host is actually a VERY good host and I highly recommend them.  BUT, it is in their terms as to certain activity.  Once I was able to speak to them, I found out the main issues and got them taken care of.  It wasnt the number of posts, it was CERTAIN posts that had been locked and archived a long time ago.  That and CERTAIN user accounts.  Both the posts and accounts were spam bots. Additionally, a lot of resources were being used on the search functions.  So that was disabled for all but registered users.  
Speaking of which, we had something like 400-500 users that had either: A-never posted, B-only posted once, or C-not posted in over 3 years.  They were subsequently removed.