1) LE Is a big reason
2) Boss
3) Girls with too big of egos, nasty habits, Pimps etc.
4) Too many undesired regulars that u can't turn away because the boss at a spa won't let u
5) Hours (many spas make u work crazy long hours and u have to be fresh and happy for every customer even if you've been there for 12 hours and your tired)
6) Dirty spas (they don't let u change the sheets, bedding etc.)
7) Stipulations ( the spa puts too many restrictions on what u can do and some girls don't abide and some do and that causes sooo much tension)
8) Jealousy (If your better looking, have more clients or whatever then the other girls.. the attendants make your life hell at that spa)
Hope that helps to answer your question but thats according to someone that knows the biz enough to comment on that subject!