I don't want to, or mean to do any stereotypical racial/cultural profiling here, but I live in a town with a lot of Asian and Mexican Immigrants, and this is my experience. this does not refer to people who are assimilated into the culture, but new arrivals.
I find that people from Asia and Mexico have different expectations from readings than standard (Is there a standard?) Issue white Americans do. The Immigrant Asians I have read for take the whole things very seriously, ask very pointed, deliberate detailed questions, and don't do much discussion during the reading. Lots of Immigration issues, job issues, all very practical, long-range questions. It seems to be pretty Oracular to them; there is a tendency to view the reading as set in stone rather than as the result of choices made, that can change with different choices. However, they do make life-choices based on readings, that's usually why they come for readings.
With the Mexican immigrants, it is also taken very seriously, but is less used as a life-planning session, more as information on emotional issues, marital problems, jobs, and if they are cursed by someone, and who....with something of an expectation that you are a Bruja of some sort, and can give them spells, etc., to avert misfortune.
Neither of these groups are much interested in spiritual issues and growth. a reader I know says that she sees it as connected to Maslow's (spelling?) heirarchy of needs--before people are going to spend time, money and energy on spiritual guidance from Tarot, they must have their survival and emotional needs met. She feels it is more a issue of Income than Culture. I see it as some of both.