First, I love the look of sprayed furniture, it is so smooth and if done right it can produce a perfect finish.
Second, I am a perfectionist. I always look at those beautiful chippy pieces and think to myself "I love that look....I can do that." but I can't because it has to be balanced and symmetrical. All areas have to be distressed evenly, I can't have a side that is more chippy than the other or it bothers me, like keeps me up at night bothers me.
Third, it has held up best against my kids. I am sure my kids are much like yours, they climb on my furniture when I am not looking, leave their half eaten suckers on my sofa tables, or their water bottles on the coffee table without a coaster. Most of the time, knock on wood, it has wiped up without any evidence.
Fourth it is cheaper than most specialty paints. I do use high end paint usually Valspar Optimus or Sherwin Williams which does run about $50 a gallon. But the higher end latex paints cover better and hold up much better as well.
Fifth it is convenient, if I run out of a paint color or a top coat I just hop in the car and drive down the street 5 minutes.
Latex does have it's draw backs, for example it does require more prep work up front, like sanding, lots and lots of sanding! Or sometimes when I am distressing it can start to ball up.
Now, I am not saying I don't like specialty paints, I love to use chalk paint on accent pieces or decor items. And if I am being honest I have never used milk paint. I have wanted to give it a go but I haven't found the right piece. It is on my TO DO list!
You know, when something is working for you it is hard to get out of your groove.