I had over 30 sites that this happened to early this year. To make it worse I was buying hosting from someone who was buying it from someone else.These people had a falling out and I was in the middle. I do think it was strange that it happened in the middle of this falling out.
It was just a diaster. I lost one major site completely and I am still working to get things back.This diaster has put me so far behind. I lost a major community site I was running, I doubt if I will be able to get the majority of ex users back. Not to mention the major drop in traffic from the search engines while the site was down.
I am now very concerned about the security of word press, joomla and drupal type sites. I have a couple of hundred word press sites which I am now converting with xsitepro [ no I am nothing to do with this company} to ordinary html sites.
The problem with the joomla, drupal. wordpress type sites, is there is some sort of update every week or so. If you have a few hundred sites, you spend all your time updating sites to the latest version. Then a complete new version comes out, and guess what half the plug in's you use to make your site are not updated to work with the newer version.
Keeping your site up to date does not always work [ it does help}.
I use coppermine on about 6 sites. The scripts where up to date and a week later all the coppermine galleries where hacked.
Maybe with drupal's multisite feature you get around this by having one installion for a hundred sites, but I am concerned about traffic from search engines when you do this.
The hackers- all I think is -what a waste of time and energy.
I struggle so much on the internet and would love to be more talented.
I just wish the hackers would put there talents into better things.