I do find that you get a different mix of people in for the cup games. There is definitely a lot more people bring their kids, and you can tell a lot of people aren't those who go all the time, too.
I think keeping it low to encourage that is good, every kid should get to come and see the Villa now and then. Plus, you see a lot more club shop bags on those days, suggesting people are taking the opportunity get merchandise on their visit.
We need kids and younger people getting hooked on watching games in person, and not just on TVs and iPads.