I think that investing in your kids is never a waste of money. It is very important to give them the possibility to develop themselves and sport is a very good motivation. I think that travel sport gives them much experience, they learn more about different countries which is great. I would like to have such experience, and if you can give it to your kids, give it. I started to follow this blog Nomadific
there is a guide of traveling. They also write there about how to create form traveling a business. So don't you think that this can help your kids to find out some ideas that will create their future? My opinion!