As an alumni of the BMI club it's not that big of a deal. BMI 30-34 earns you a visit with a nurse every 3 months to "check" your progress on your weight loss. So long as you are <34 it's not really a big deal. Extra blood test for your medical and that's about it. There may be a catch with the loss of license as they put a clause in there a few years back saying that if you are not following the BMI plan you are SOL.
Loosing a couple of KG to get to 29.9998 is worth the effort if you can manage, but it's not the end of the world if you are over 30.