I agree with the OP in the sense that it would be nice if the board were in the front lobby, but sometimes it isn't possible. In London, many shows have it out front, but it's often not accurate for a variety of reasons.
I also agree that many people see shows because of a specific performer or performers, but there's just no way to know you'll see who you want until the curtain rises. It's the nature of the business.
The board is probably in the middle lobby so that stage management can access it all the way up until the lobby opens without having to deal with patron traffic. There is a cut-off time when the stuffers (those little slips of paper) have to make it to the ushers, otherwise they can't stuff the programs in time for house opening. Usually it's 90 minutes before curtain. So, if a performer calls out after that cutoff time, then the board has to be changed and a live announcement made to fulfill the union requirement. As most of us know, actors have up until 30 minutes before the show to be on site and sign in, so late call outs are common.
In terms of the slider board, on the road it's slightly different depending on where you are and who is in charge. Sometimes Stage Managers hate making announcements and avoid them like the plague. Other SMs favor the announcements over printing and cutting up thousands of stuffers. Sometimes if we were in a huge house (like the Fox theaters is St. Louis or Atlanta), it's just too much to print up and/or stuff 3500 stuffers so they don't bother. Sometimes the theatre doesn't want to pay ushers to show up early and stuff programs so there are no stuffers in that city. And so on...
On my last tour the board was often wrong for various reasons. Sometimes a lot was happening last minute and they didn't have the time to change it or someone called out during the overture. Sometimes they forgot to change it on a two show day and the names on the board were from the matinee. They did their best, but sometimes it just didn't happen.
Sometimes the stuffers in the program were from the previous show. The ushers are supposed to un-stuff the unused programs from the last show, but sometimes they don't or they miss a few.
Unless something is scheduled in advance, Box Office staff is often the last to know, if they ever know at all. It's not a reliable source of information much of the time. Maybe in New York they are more well informed than on the road, I don't know.
Basically, it's a flawed system at best, and that's why there are 3 methods of notification- the information should get to you before the curtain rises somehow.
Updated On: 6/7/11 at 09:02 PM