I just ordered this online and plan to have it installed once it all makes it to Chicago - ordered the bike carrier accessory as well. Ouch, but both together was like $2000. I guess $1250 for the towing package isn't unreasonable and wanted to add it before it disappears from the store. I felt that I could see them stop offering the retrofit in time due to having too much to keep up, busy service centers after M3 release, etc.
Look forward to using it and having the capability to tow at least, which I'll use time to time in the future.