The trick is, if you have a particularly strong or unique brand, you can count on being the number one organic result. HOWEVER, if competitors bid on your brand and you do not, they end up above your brand in results as part of the the paid/promoted position.
This usually forces brands into competing in paid positions on branded keywords that they should "win" naturally. Google rationalizes this by charging more relevant results a lower rate, but it still doesn't excuse the fact that the brand shouldn't have had to pay in the first place.
