Having worked in the medical field for 20 years, 7 of which was in Microbiology, I'm going to get in my 2 cents.
The only way to sterilize something is with an autoclave as was mentioned earlier. This would turn scales into a pile of worthless melted goo. You need high temperature and pressure to kill any spores that might be present.
A 10% solution of bleach and water is all that is required to kill 99% of all bacteria and viruses out there. The only thing it can't get is the spores that require the heat and pressure that was mentioned above. 10% bleach is approved by all agencys that monitor our medical labs and we are required to clean our work benches after every shift with it. Using a stronger solution isn't any more effective because the spores can survive even straight bleach.
Bleach is not a good solution to use on metal though and over a period of time you will start to see pitting on the surface. We have stainless steel counters in our lab and at first glance they look pretty good but on closer inspection, you can see the damage that the bleach has slowly done.
Boiling water is very effective in killing organisms as is lysol, listerine, and any good anti-bacterial hand soap. Boiling a kettle of water and pouring it over the razor blade does a great job and I have done it many times. I just keep it off the scales because I'm not sure how the heat would affect them.
I have no idea what is in the barbercide but I doubt that it will kill any harmful spores. They resist everything short of autoclaving. Having said that, spores are generally airborne and the chances of having any on a blade is pretty slim. If you were to receive a razor that had lots of spores on it, you would have already been exposed to them by just opening up the box and moving the razor through the air.
The HIV virus is a very fragile virus and cannot be exposed to air for more then a couple of minutes before it dies. You would have to take a razor from an infected person and use it within minutes to have even a small chance of contracting it.
The Hepatitis virus is a little heartier and could hang around on a used blade for awhile. Hepatitis is alot easier to contract then HIV. Hepatitis was the main concern with Barbers and is why they had to go with disposable blades. It is the main hazard in my field also, I have been stuck with 4 dirty needles over the past 20 years and fortunately I haven't contracted anything.
Bottom line, your skin is a pretty good barrier against organisms. If you clean your blade with a good disinfectant or use boiling water, your chances of getting anything is slim. I would bet a good soak in a glass of original listerine would kill the same amount of bacteria that the Barbacides do:)
Relax guys, and enjoy the shaves.
Chuck