Good question. Sometimes they get a little wild because the only place that can get my eyebrows perfect is about a 30 to 40 minute drive. So, sometimes you will find me plucking here and there...but generally I leave them be so they can look in shape 80% of the time! ;)
I prefer to have mine waxed because they are uneven and grow in all sorts of directions. I didn't pay them any attention during high school because I was oblivious to how terrible they did in fact look, but now I can't help but pay attention to them. I'm with jonaj. One can get carried away. One can get *very* carried away. Too bad I got carried away for my son's first Christmas. Now when people look at the photos, they assume I was sick at the time.
Used to get my beautician to wax my eyebrows. but now I have found a good threading lady who does a wonderful job of keeping my eyebrows in shape. but if I am rather busy and cannot possibly find time to go to the saloon I pluck it myself with the tweezers. But just to tidy up.
For a couple of years I took the cheat's way out and cut my hair into a fringe that sat just below my eyebrows. That way they were hidden and I didn't have to do anything about them! The downside is now that I've grown my fringe out I keep forgetting they need more frequent maintenance...