True, it doesn't solve all the problems, but taking on EBay one vertical at a time using a great domain for each field might be a very powerful strategy. EBays

True, it doesn't solve all the problems, but taking on EBay one vertical at a time using a great domain for each field might be a very powerful strategy. EBays greatest moat is the sheer number of sellers and buyers it has, instead of trying to fight the entire EBay network, you take them on one vertical at a time. And maybe later after you've captured enough verticals try to consolidate all the vertical sites into a single property.