I really like the idea of automating these things, I am pretty sure I miss out on a ton of free deals and good opportunities to save money. However, the amount of trust I'd have to have in any system where they can scan all of my email with impunity.... Hooo boy. Ain't going to happen anytime soon.
It's a zero sum game though... if everyone did this then the price you pay in the first place will go up or they would be cancelled. These benefits only work because most people don't take advantage of them.
