Waste their time?? Playing at Regionals is a waste of their time?? That is the biggest stage to play on! It is a great opportunity. Even if you are not playing in college, its a great place to finish or possibly continue your soccer career. Regarding expenses, many teams have fundraisers and corporate assistance to help with the costs, as well as individual clubs often are able to help. CESA Regional teams may even be fully-funded. I do not know.
But I do know it is not a waste of time even at U18, especially since they have played soccer for over half their lives.