[33girl]

They have to sponsor a speaker for the whole Greek community. This isn't fining but still has costs and will hit them in the wallet.

I think I've heard of groups not being allowed to do certain things at formal recruitment - for example, if most groups sing and clap when the PNMs enter, they are not allowed to do so and must just welcome them quietly. This makes the PNMs wonder "wtf?" and maybe makes the group not as attractive. This could also work with decorations, clothing, rooms used etc.