I can think of about a thousand different things to spend $15,000 on that would offer a lot more enjoyment than The Man Wall.
If you've got kids and are a sports fan, stick with the one decent HDTV -- ours is 37" and I watch sports for a living -- that you can get for anywhere between $500 and $2000, then spend the rest of that $15,000 on, oh, socking it away for your kids' college payments.
And if that's too abstract and you really do want to spend that money on something "fun," try tickets to games or -- better yet -- some fun sports equipment that you can use with your kids.
(As always, I'm not suggesting that you aspire to turn your kid into some kind of robo-athlete. But if you want to get them to love sports as a fan, get them to play sports as a kid.)