Correlation means correlation, not that something is impossible. In other words, just because, for example, a poor person can afford to go to sauna 4-7 times a week it doesn't mean that there's no correlation between income level and sauna usage.

Another example would be drinking an "expensive" wine at least once a month. I'd claim that a lot of poor people can afford a $25 wine monthly, but there can still be a correlation between income and buying an expensive wine at least once a month.