With games, I like seeing some games that I think are a total joke fail (i.e. all of the Wii's "test" games like DS:E), and I like seeing games I like and want more of perform well (I want a Mirror's Edge sequel, I also think Ninja Theory sucks for ditching Heavenly Sword after such good sales, and I liked watching Valkyria Chronicles sales take off 6 months post release).
With regards to consoles, I just want more developer support for the consoles I love. It infuriates me that the Wii is selling so well and has such shitty games, because in the first year of its release I believed the great sales would mean great games with large budgets, but instead we get a lot of cash-ins and mediocre developers making games on the Wii. I want the PS3 to win because I want more exclusives for it, since all the PS3 exclusives I've played have graphically eclipsed 360 exclusives.
Another reason I care about console sales is because if the PS3 performed worse, it wouldn't be the lead platform for most multiplatform titles, the 360 would still be the lead platform. I won't deny multiplatform superiority on the 360, because multiplatform titles never take advantage of the SPE's.
Currently playing: Uncharted: Drake's Fortune, NBA2k11, Metal Gear Solid, Picross 3d