LOL @ Luke!

Hey Rich, have you thought about a password abuse protection service?
We had this problem as well with hotlinking. We signed up with PhantomFrog.com with the trial and were absolutely impressed with the outcome that we signed up. We've been with PhantomFrog.com now for several months and WILL NOT leave unless Frog should go out of business and will stand firm on their product.
We've had password abuse, brute force attacks, and members to come in using a download accelerator program. PhantomFrog eliminated ALL OF THIS.

I at least suggest the trial. It's free to use the trial and I am sure you will be impressed as we were in this product.

It is very afordable and in my eyes a great service. Here's more info on what we use: http://phantomfrog.com/faq.php