It's part of the real estate business. Agents, like myself, who enjoy this aspect of the business, choose to specialize in reo's. It's fast-moving and it's always a necessary part of the real estate market.
I enjoy dealing with banks because it's very dry and to the point. Don't get me wrong, banks and loan servicing companies can be VERY difficult to work with, but all-in-all, it's demanding and I like that.
There is also other avenues for income, not just selling properties.