When you do a 2 game pool and then double elim and you have more than 8 teams in a age group and if you have several age groups, and depending on the number of fields , you almost have to start the event on Friday and play at least one of the pool games and maybe both on Friday. I always find it handy to look at a double elim bracket and put times in to see where it takes me.
You can almost count on your schedule getting messed up becasue you are going to get some tied games that can take several innings to play and the further into the bracket, the less likely you will see run ruled games.
Like Cincy Storm, I see the value in playing in at least a couple of double elim events a year, especially if you are planning to go to Nationals and play that format. I can understand that some teams do not pursue playing in national events so the double elimination format may not be appealing to them.