Good for you that your daughter's schedule only requires flying 3-4x, and she will only miss 6 days of school given her light travel schedule compared to other regions, but try having to fly 9x in one season and get back to me. In some regions, you can multiply your travel costs by 3 to account for the additional 5 or 6 extra flights and lodging costs, plus another $2,500 for a typical decent club's GDA fees, and now you're talking. Then you get to $12-15K when you're forced to accompany your kid to one of the showcases after she had to fly separately because, go figure, her school doesn't exactly revolve around USSF and we aren't home-schooling our daughter as part of a master plan to make her the greatest female soccer player in history (as an aside, you should read this article when you have the chance if you haven't already.
https://www.nytimes.com/2018/09/05/sports/soccer/uswnt-bayern-munich-olivia-moultrie.html). Presto, you're right there in the $12k-$15k range.
It's swell you've gotten off so cheaply, and cute that you think your costs are exactly the same as everyone else's despite playing in the region with the least travel. Your daughter played in what, four states last year, including a quick AZ trip that hardly counts? What do you think it cost Nationals to play in 9 states, or 8 like the rest of the teams in their division? How much does it cost La Roca in the NW which only played in 5 states but flew at least 9x (4x to CA, 2x to WA, OR, FL, NC)? Or Quakes playing in 7 states, plus two trips to SoCal.
The irony here is that high cost elite soccer has been great for my daughter, and it seems to be going great for yours too. I can afford it, and it significantly reduced the number of kids against whom my daughter would otherwise have competed for scholarship dollars and even admission to her dream school. But just because it was good for my daughter doesn't make it good for youth soccer overall. To the contrary, USSF has created a structure that runs thousands of kids out of the sport (or at least its highest levels) every year due to the ridiculous unnecessary travel costs, and runs more off because the rigid commitments and inability to grasp that kids stop doing things that are no longer fun. Why does it do this? Because of the 1000+ girls who play in each age group, on average the two best will become WNT regulars and hopefully will be slightly better than if they played elsewhere (which is highly debatable). That's great for .2% of the kids in GDA, and bad for 99.8%. It's probably also bad for the .2%, because I'm pretty sure we are going to find that GDA put the US behind where it should have been, just like it already did with the men.