By clicking on the keyword tool you can get a whole bunch of keywords to negative match and others to bid on, which is great.
But so can your competitors, and loosely connected competitors and simile competitors, and plural competitors and synonym competitors.
4p clicks will now run to a lot more than that in most cases if you want to be in the same position.
Option 1. - Increase bid prices, keep position
Option 2. - Keep bid prices same, lose position
I don't have a problem with the concept of extended broad matching but the playing field has been levelled and made much wider.