You’re relying to a post over a year old. 
Depends totally on the model, trim, year, time listed, etc. This is very much a variable.
X7’s for example are practically being sold off the truck at between invoice and sticker, meanwhile I was able to grab 18.3% off a heavily loaded 440 MSport coupe and 25% off ‘19 7 series isn’t unheard of.
Closing super old thread.