Last January, Marriott became the first major hotel group to announce that it would reduce its commissions on group bookings at North American properties from 10% to 7%, effective March 31, 2018.

Hilton and InterContinental Hotel Group quickly followed suit, bringing their group bookings commission rates in line with Marriott's. Hyatt, meanwhile, hopped on the bandwagon in November, with its 7% group bookings commission rate set to start with business booked in the U.S. on or after Feb. 1.

Bonni Scepkowski, president and chief strategy officer for Stellar Meetings & Events, said, "We're adjusting, but it's been really disappointing. Since Marriott took that first leap, everyone has followed, including companies that said they wouldn't, like Hyatt."