I too see accounting as a hurdle but think customer validation might suffer as well. "Get off the boat" actually has a nicer ring than "get out of the building" but will obviously be harder. As much as I love hackathons, there are fringe benefits to mixing with normal-folk on occasion. I can't explain how much I've learned from overhearing women explain Pintrest to one-another.
What about bringing customers to the boat? Weekly "demo days" could bring a ferry-full of future customers to the ship, either dedicated to a single startup (for B2B/specialist businesses) or shared between many (for general/consumer ones). The added advantage? People who are willing to head out to the middle of the ocean to try a new product would, I'd think, be archetypical "earlyvangelists".
