Do most dancers set their own work hours?

I was just wondering why in the clubs I have visited do some dancers come in later in the night while others come in early. Seems like some girls will work a 7 or 8 hour shift while others only work 5 or 6hours in a shift. I went to see this one dancer who had changed clubs. She told me what days she would be working at the clubs but she didn't tell me what time she would get there. I was there for about a good hour before she got there and still didn't get to say much to her because she had ran off to do a private dance for someone. I got up and left because I was already bored and didn't want to wait around in a club I didn't care to be in. To me it seems like the dancers who are the "Money Makers" can come in when they want to do so while the "average" dancer or newbies are the one who are the when the clubs first opens at night or the evening. I know some of the dancers might have situations where they have to stay with the kids unitl a babysitter can get to there house but I think some of them don't want to be sitting around when the club isn't busy they would rather come in at 9:30 or 10:00 when the club is getting crunked up. Should dancers who don't have kids have a say so in the hours they can or cannot work? We don't in the "real world" have a say in the hours we work unless we have another job or are in school and that's only on certian jobs that are willing to work with you.