One of mine has represented the UK in 2 different disability sports in 6 different countries. Between 11 and 14 we were taking him to different training days/weekends maybe 5 days out of 8 at weekends. From 14 he began to cross London independantly,changing tube lines to go to training. This had led him to be a confident travellor. We would still take him to matches at weekends. Often spending 8 hours out of our home.
Some of the benefits of his involvement in elite sport - mixing with other young people from all over the UK. Meeting people who had the same disability ( he was the only one with his quite obvious disability in his mainstream school) . Who became positive role models. Learning how to keep himself fit and eat healthily. Lots of fun. Playing in 5 different countries in 4 different continents and meeting players from those countries. Going on to train as a coach and give back to younger players. Doing a degree in sport and working in sports development... and still taking part in sport though not at elite level.
Some disadvantages - one of his brothers needing to come to some of the matches/training sessions with us and getting bored( he also did a sport til he was about 13) having to arrange weekends away around matches.
And my husband getting involved in the sport and still volunteering a day every weekend even though our son is not involved any more !