My impression has always been that the dancers love it. They sometimes give away their dance shoes and other mementoes. What is better after an excellent performance than close-up personal adulation for your most worshipful fans?
The dancers that do go for the appreciation in spite of the effort, ought to be accommodated in this way. I was thinking that as Miss Marm suggests, some might be too tired to, and there would be a way of handling that situation graciously.