Would you buy a snowmobile on eBay because Jim Gaffigan tells you to? The answer, of course, is no. Could you enjoy his attempts to persuade you in a TV commercial? Well, yes ... in theory. In practice, however, viewers might hit the fast-forward button. Sadly, the same is true of much of this new campaign from Goodby, Silverstein & Partners for the fading auction powerhouse. See a whole bunch of ads here. eBay crested during Web 1.0, and this effort seems hell-bent on delivering old-hat, mo