If I remember correctly from a Hampton Roads district meeting with VirginiaFIRST staff, VCU was ruled out as host for the 2016 DCMP due to a scheduling conflict, not with the venue, but around the venue. The streets will be closed that Saturday morning for a race (5K or marathon of some kind) and teams would be unable to get to the venue.
For those discussing costs, I worked
this spreadsheet up a few months ago. It is estimating registration, travel, and food costs for our small team that typically travels with 15 or less students/mentors total. A few assumptions include event locations, Saturday/Sunday district events, and my knowledge of our costs such as sharing of buses and number of hotel rooms and meals required.
TL;DR: Costs for our small team are approximately $7,800 less for a two district system versus a two regional system. Other teams will of course have varying costs.