My daughter does wedding makeup and uses Mary Kay predominately, but I would hazard to guess that most pros use a pic-a-mix of products as do most woman. Perhaps one brand of mascara works and another brand of foundation. I probably have three to four separate brands in my makeup bag as I type. I would also suspect that professional makeup artists, just as other professionals, are deluged by company samples in hopes that they will be converted to a brand. Think pharmacy reps that constantly visit doctor's offices. Anyway, I'm a writer who works in technology so what do I know. : ) But I do love makeup!