The latest trend, which probably started about 18 months ago, is to have multiple models at an organized shoot, 3 to 4 appeared to be the norm these days.
To the uninformed, this might sound like a great deal. Same/similar pricing, now I can shoot 4 models.
Let me do some maths first.
The photographer to model ratio is 6:1. This has been the case when there was only 1 model at a shoot to the current multiple models circus.
The duration of a shoot seemed to be pegged firmly at 3 hours or 180 minutes.
When there were only 1 model, each photographer (one of six) has an equivalent of 30 minutes to work one on one with the model. The team of six, has time to innovate and create.
Fast forward to today, a 4 model organized shoot, with 4 team of six photographers during a 3 hours shoot. Under perfect timing condition, each team has 45 minutes to work with a model, each photographer has an equivalent of 7.5 minutes to work one on one with the model. There are simply no time to create, let alone innovate. Every photographer will crowd in front and fire away.
These are facts pertaining to the organized shoot environment of today.
These circus shoot, everybody loose but one. The photographers loose the most, paying and wasting hard disk space, the models loose too because horrible pictures of themselves get circulated, but the economics for the organizers appeared to be the best.