I recognise some organisers 'put on a show' and attract many riders from outside the Audax community because of the attractive package at a low cost compared with a sportive and I also recognise this puts off some potential organisers who may feel they have to 'step up to the plate' and do likewise.
Some organisers choose to 'step up to the plate' and 'put on a show', some organisers choose to run X-rated events. Both types of event seem pretty popular with riders, so I don't think there's any real pressure on potential organisers to choose one route or the other.
Certainly the desultory thoughts I've had about a possible event focus more on running the sort of brevet I would want to ride, and on nicking good ideas from other organisers rather than feeling pressured to out-do them.
Mandating a 'no frills brevet' system would make this a level playing field and possibly bring more organisers back into the fold.
There is nothing at all preventing organisers running a no-frills brevet. Many successful and popular rides are just that - I don't think you can get much more barebones than iddu's
Poor Student, with its car park start, commercial controls and postal finish - and even two of this year's 1000km events are in this category. But it's those organisers' choice to run them sans frills.
Mandating no-frills events - prohibiting TLC - would be a serious limitation on those organisers who choose to offer more, and on those riders who choose to take advantage of it.