Lower Onion Creek Group Sites

our group reserved the site for sat. There was a commercial group at the site on Friday. Their group had many tents scattered over an area clearly marked "no camping". When noon came and went, the group did not leave. The clients were still on the river. The clients arrived back at camp around 1:00 pm. The group was then fed lunch, and proceeded to begin packing their tents. I spoke with the trip leader several times - he just keep saying they were leaving. They did not leave camp until 3:00 pm. I am positive their group size was well above the limit. This is also a for-profit company, and I am under the impression this is not allowed. We did not camp at the site due to the late hour and heat. I spoke with the BLM re this issue, I was told they have had many complaints about this particular group. I would also question whether commercial groups are given preference in the reservation system. All said, it was a terrible experience.