So the problem isn't really the fee but the "tryout process"? Yes the goal should be to get as many as possible to tryout but the club must protect itself in some way against mass tryout and then rejection by selected players. Who controls the process anyways the players or the club? By the club requiring a small fee to tryout they are recouping some of their risk exposure as it relates to the club as a whole. I would expect most clubs to return feedback on reasons a player was not selected for the team. But yet again most of the big clubs are trying to serve all levels of soccer by having the various levels offered so they will be working with most to take those skills to the next level.
