For those reading, I haven't been involved day-to-day with Everlane since early this year. I now help run Dev Bootcamp (
http://devbootcamp.com). That's just to say I'm speaking for myself only, not for Everlane.
Funny story: Everlane started off doing something similar to Svpply and Pinterest and quickly realized the only way to win would be to catch lightning in a bottle. Congrats on Pinterest for pulling that one off. :)
Exposure is always a major challenge and nobody's going to begrudge a new source of traffic. Assuming a company is aiming to "go big," though, they fall into one of two categories:
1. They have momentum
2. They don't yet have momentum
For people in (1), their inclination will be to double-down on whatever's working today. New platform? Come back to me when you can send 10k potential customers our way.
For people in (2), focus is the priority. You're small. You don't have much cash. Every second counts. Opportunity cost is everything.
The "tl;dr" of everything below is this: merchants aren't interested in a third-party aggregation or discovery service until it can delivers thousands of customers to their (virtual) door.
Read on. If you dare.
Those people are going to focus on 1-2 highly-leveraged opportunities. It's a classic chicken-and-egg: they won't want to devote energy to playing with a new "product discovery platform" until that platform can return 10-100-1000x the opportunity cost.
This is entirely ignoring the branding implications of embracing a neutral, product-centric, third-party platform as a main customer acquisition channel, FWIW.
Svpply tried to get around this by side-stepping the content creators and letting their users find and post content. Pinterest got around this by having less-strict editorial guidelines so that users could post super-viral but less-commercial content, e.g., "Check out Lindsay Lohan's new haircut! (photo) (photo) (photo)."
Those are thin wedges to base a whole company on, IMO, but maybe I'm just risk-averse†. It obviously worked for Pinterest.
If I were advising someone in group (2) I'd tell them to find what networks their current or potential customers are spending time on and focus exclusively on those. If there's one network, all the better -- focus exclusively on that one. Odds are "that one" isn't whatever you're building.
For Everlane, we got a lot of benefit out of focusing entirely on Tumblr (http://tumblr.everlane.com).
Through a combination of well-crafted editorial (Michael) and "stupid viral tricks" (me), Everlane's tumblr was, in late 2010/early 2011, the largest in the men's fashion category and one of the largest in the fashion category.
Today I'd consider Pinterest a viable platform to experiment with, too, but in 2010-2011 Pinterest had no traffic at all.
†: I'm kidding. Early on at Everlane everyone and their uncle was pushing us to be a "discovery platform blah blah blah" and when we said we thought the opportunity was vertically integrated commerce they told us we were insane.
Well, except our seed investors and early employees. God bless them. :)