Some shows I've been to have a girl just stripping to a rock song. What is the line between a burlesque act and just any stripper act? Besides the audiences being different, and the motivation of the dancer being different.
Sometimes the audiences and the motivation of the dancer are the only differences. Those are big differences!
However, what I like to see are references to the movements and mischief in vintage burlesque--not a throwback, but a flavor in the performance that indicates that the performer knows s/he represents a long line of undomesticated ladies.
And a performer can't really get to the next level, as far as getting hired goes, if s/he doesn't present some kind of glamourous spectacle or exciting story line. Otherwise s/he'll very likely just keep getting bar gigs.
Some performers, however, get flown all over the world to get gigs!