Hey Lazy- I'm with ya all the way on feeding, I've been trying not to, and didn't last summer. They made enough honey for themselves and seem to be doing well so far this summer. However, some of the beeks in my area said that they just aren't getting any honey, which tells me that maybe they will make just enough for themselves. If I feed them, then I told that that will help them produce extra honey. My personal judge and jury is still out on this issue.
Also, I must tell you that, Yes! hives Do get robbed! It took me three years to get my hive up and running healthy and last year, a strange black bottomed bee, maybe feral, came to my hive every day, it freaked my bees out and they swarmed three times. So I got a robbing screen and I still once in awhile see this black bottomed bee hanging out at the bottom of the screen, but they don't know how to get in.
If you are on Facebook, look up Peace Bees, they are out of Indiana, they don't feed or medicate, they are successful, and they are a great bunch of people. They helped me out tremendously last spring when I was panicking about 3 swarms leaving my hive.