Colleges invite you to their camps because they are not allowed to call you until after your Junior year in HS. Of course you have to pay $$ to attend the camp. Very rarely do you see an SEC school at tournaments unless its Perfect Game. So each person has to decide how much they want to spend chasing the dream imo. In regards to UT, they have several showcase camps in the fall. If you want to be seen by them you have to go to the camp or take a chance they show up at a Perfect Game, which cost even more $$$.