I don't hatch eggs, but it does seem to be addictive for those that do. The reason I don't is because of space limitations (small coop and run), and the fact that you can't choose the sex of the eggs, you have to take what you get. Some people have an unwanted knack for hatching out future roosters. You have to have a plan about what to do with unwanted male chicks.
Also, you have to be prepared for the accidents of birth, such as unabsorbed yolk, leg problems, deformaties, etc. Most people never see those because they are "taken care of" at the hatchery.
I'd have chickens for while before deciding to expand in that direction. But that's me, I'm a cautious person...