Both rinks I skate at are municipal rinks without clubs, but guess the skate swaps function similarly. IRRC both charges 10% commission, one rink has stricter policy regarding drop off and pick up (very short time window on the day of skate swap, must fill out forms to obtain a seller number, rules on how to label, unsold items not picked up within required timeframe get discarded etc), and the other quite laid back (drop off at and pick up from concession stand anytime). Cash transactions only. Lots of volunteer work IMO.