Companies snapping up merchants selling on Amazon to build in more e-commerce economies of scale into the model are on a rapid pace of growth at the moment, fueled in no small part by giant infusions of money from the world of venture capital. In the latest development, Berlin’s Razor Group — one of the more ambitious of the aggregators out of Europe — has now raised $125 million of equity funding in a Series B round that CEO and co-founder Tushar Ahluwalia said pushes the company past a $1 billion valuation.