I'm still pretty new to the BPO/REO scene as well, but I'm happy to share my limited experience.
I did BPOs for a company for about 9 months before I got one of their listings. I agree with xstudiox and shamrock that they are high maintenance. I was lucky that my listing was in a nice area with good schools. Even though the house was a disaster, I was able to pick up a few buyers that weren't interested in that property but have bought/made offers on other properties. The additional business that I picked up is what made it worthwhile.
You'll probably notice that a few agents in your area handle most of the REO listings, so it can be hard to "break in" to that. Also, as others mentioned, the company that orders the BPO doesn't always handle the listing/property management. Good luck.