[Germany] Serial entrepreneurs and investors Christoph Janz and Mark Gazecki have invested in Momox, Germany’s leading online trade-in service for media products. Momox has run on revenues since 2003, but is now pulling in around €10m a year. The German-only site, which lets users trade-in their used books, CDs, DVDs and games for cash, will use the investment to expand (and hopefully get a UI makeover, geez). The combined investment was €250,000.