I mean, that’s what they meant too. They’re expensive! Kinda a stereotypical rich thing to have, more so than therapy. One distinction that you might be thinking of without saying between individual sessions and group workouts which are cheaper.

Personal training sessions with experienced staff at my David Lloyds in London are around £50-60 for 45 minutes. That's entry-level cost for therapy, which can easily go north of £100 per hour around here.

I reckon the reason people use therapy is not because it's cheaper, but because they're less confident about how to do "mental exercise" than they are physical exercise.