"Considering that would last the average person 9 years and it's only good for two
years I don't see the advantage of that"
Agreed...it would only be economical for someone who was going to share it or on-sell it.
I have recently been taking 5000mcg biotin once per day whether or not I use ALA. I also eat a lot of biotin rich foods (legumes, brewer's yeast, egg yolks, whole grains, nuts and mushrooms etc...). However it is always possible that I need more. I haven't had the problem since I've been using the P7 though.