You're definitely not wrong. Mindfulness tends to appeal to three types of people: people who want to "hack" their consciousness (these types often experiment with drugs, usually psychadelics), people who have mental health issues and don't want to use drugs, and spiritual/religious sorts who are looking for some form of spiritual meaning. Often you'll find people with some mix of these desires in the community. I think this makes sense though; the kind of people who are going to deliberately cultivate some property of the mind is generally someone who cares a lot about their mind for some reason or the other.