Just a little bit as you'd have more contact patch. But there's not enough camber in the factory spec, at least on the fronts. The fronts are at -.5 and the rears are at -.9 (from an owner on twitter who got an alignment). For a sports sedan that's very conservative, so I disagree that camber won't help.
We'd have to agree on what "help" means in this case. If just aesthetics, I agree. But what's the reason that they went so conservative on the factory specs for camber? Purely for efficiency? Tire wear? clearly not max handling or aesthetics!
Edit: The biggest change you could make looks wise is a different offset that would push the wheels out. But I would still go bigger with the tire rather than smaller with the wheel for looks and performance. I know people are concerned with efficiency, but that's not my number one concern. My number one concern would be performance and handling, but that's just me.
Yeah, I get it. Wider rims and even wider tires on the rear would of course help aesthetics AND performance. At the expense of efficiency of course.
I'm just trying to figure out the best balance of everything. I'd like two things improved: Protection of the rims with a bit of extra rubber, and the aesthetics. I'm not willing to take a big range hit for either of those, however. Performance for my non-performance vehicle is "good enough."
As time goes on, I'm sure there will be plenty of experimentation and photographs (and data) for different wheel/tire combos.