Fatties commonly buy gym memberships they don't use. It's central to the economic models of a lot of fat-oriented gyms that most paying members rarely or never use the facility. Fatties buy memberships on New Year's when they've made yet another resolution to get in shape. They show up every three or four months to cancel and are shamed into renewing their vow by the staff only to once again abandon it. That said, the fact some profit off the obesity epidemic doesn't mean they're not a net drain on civilization.