Wow, I can see a few very easy low impact fixes that help mitigate this problem. But really, who doesn't store the account and value in a central DB? It's easy stuff. 

I know, lets release a shopping cart and store the prices in the HTML form! Great idea.

GZ

An injunction? I’d say these people got off light.

It’s a good thing that their presentation didn’t include flashing lights; or they could be facing the bomb squad:

http://www.forbes.com/2007/02/01/cx_ml_0201varitytv.html

or SWAT

http://machinist.salon.com/blog/2007/09/21/star_simpson/

a quick search reveals a much more informative yahoo news article that supplies everything else you expected this reporter to provide. 
If i wanted to research stories myself i would not bother reading this site.
http://www-tech.mit.edu/V128/N30/subway/Defcon_Presentation.pdf

go get some caffine nick, seems like you need some.