I also agree Mistress. Anyone who has read Jeffrey Denman's wonderful book "A Year With The Producers" will see how excited understudies are every night they are scheduled to perform. I know for a fact that casting people from all over are invited by the understudies and their agents to see the shows. Fosters understudy no doubt had relatives, casting agents, regional theatre people all waiting to see HIM perform.
Now you have relatives, casting agents, and regional theatre people who otherwise may have not seen this lower quality show, waste their time, money (dinner, possibly the show, fares) who did not see the person they wanted to see. That may be the future of an actor who doesn't know his next job, thrown down the toilet because the producers wanted to toss their multimillionaire into the role.
A truly terrible move on the part of the producers of Little Shop of Horrors.
BSoBW2: I punched Sondheim in the face after I saw Wicked and said, "Why couldn't you write like that!?"