A while ago it seemed like the incredible margins that you could make off selling something DTC was going to make this the dominant business model of the future, but that seems more and more untenable given how pernicious the power of the big social media platforms is.<p>Being a Warby Parker or a Dollar Shave Club was awesome a decade ago when it easy to get organic reach on Facebook. Not so anymore. That means that these companies now have to raise a lot more just so they can pay it renting the customer acquisition channel. And there's so much more competition.