Yahoo was quite the chooser last spring when Microsoft offered to buy it — the Yahoo board held out for a higher price. Now it’s looking more and more like the beggar. Its relationship with Google is pretty much finished before it even had a chance to begin, and it appears Yahoo is reaching the end of its rope. Used to be that Google was all hard-headed about going through with an ad revenue sharing partnership with Yahoo, regardless of what the Department of Justice had to say about it.