Their business model depends on their clients NOT returning. People who use the equipment cost them money. So they have the Lunk Alarm and the "no grunting" rules to keep the undesirables out.  They want the fats to sign up because fats will show up maybe once per month and won't cancel their memberships.  It's free money. The pizza and bagels are there to keep them coming back occasionally so they keep paying that monthly fee.