People motivations may not be clearcut even to themselves. If you generally play a range and allow good hands to be upgraded and bad hands to be downgraded, how do you disclose it? I play 12-14 NT. Approximately once every 500 hands I will upgrade an 11 or downgrade a 15. Does this make my NT-interval five points? If I was in ACBL-land and played this, I'd imagine giving full disclosure about this would attract various rulings from various directors. Protecting yourselves against incompetent directors is OK in my book. Here in Denmark, where there are none of those silly "no artificial follow up" rules, 12-14 is considered full disclosure, also on the day I table 11 extravagant or 15 aenemic hcp.