I'm in agreement that a player "should not" attend any showcases until he's made his HS Varsity Team. Only exception would be if the varsity team is top heavy and he's a "top" JV Player, then I would sign him up.
The first showcase will be a learning experience and educate your player and his parents on the talent that's "out there" away from small town USA.
You may be a top player in your area but when you hit the showcase circuit, it can be a rude awakening for some players AND their parents.
To sum it all up, when your player has "something to showcase", then by all means, support him and get him entered to display his talents. Just remember, if the showcase has games, your player will compete on the field with some of the top players in the country. Of course, this depends greatly on which showcase he attends. Some are rich with talent and others are not favorable.
PLEASE do your research BEFORE signing up your player. Ask players, parents, baseball message boards and others about which showcases to attend AND why did they make that choice. You'll be surprised to hear some of the stories. If you haven't done it yet, research the hsbbweb site thoroughly and you'll get most of your questions answered.
The hsbbweb is the #1 source of information for a baseball player and his parents in the country today.
Learning day by day on the hsbbweb...