If you do the math, and let's say your kid watches 2 1/2 hours of television a day, which is the national average. Nearly 25% of an hour long show is commercials, if you watched it live. So, over the course of a year, if you only watched Netflix, you would save yourself from having to watch 230 hours of commercials a year, which is nearly 10 days worth per year!
What will you do with all of that extra time? Watch the DVR maybe?