I would think that the time to market would be much quicker using Bitshares blockchain compared to launching a brand new one, not to mention other economies of scale regarding resources, development etc...From what I concluded observing the DNS blockchain launch, it's quite an effort and not for the timid. Lots of issues, problems, things that can go wrong, politics, user support etc.....all would probably be easier and quicker if they use Bitshares blockchain and user defined assets.