Yeah but the issue with a lot of sport watches are they have a "tacticool" look that doesn't look very fashionable, the Pebble had the unique aspect of having models that looked stylish while still maintaining their battery life.
But they have real hands, and the 'smart' part is subtle enough that most people just see a watch, a couple weeks battery is realistic as well.
Pebble hit a sweet spot in terms of how much you can do with it, while being good looking with a hardy battery. If we limit the comparison to the last two of those things, Withings is in the lead, not to mention still actively sold and supported.
Also, maybe a customer will remember the sporty watch contrasting with the formal suit, and call you instead of a competitor.
Also, Zuckerberg wears t-shirts and jeans.