My DD went to a top level tryout in our area to see how she stacked up. I don't consider it a waste of the orgs time, any more than they say all positions are open but their entire team is there and will be offered a position first.
After having her coach belittle her, chew her out, give her zero positive feedback, she wanted to see if she was really that bad. Turns out, she was the best. When a coach tells a player she's only getting time at her #2 position because she was "terrible" on the field and it was less risk for the team, they fail as a coach.
However, the intent of joining that team was there correct? I mean if they offered her a spot would she take it or go back to the coach that belittled her? That is a major difference in my mind.