I wonder if travel would work. If I did the math correct, there are about 10 weekly dinners + demo day. With a bit of planning, that's only about $4-5k of travel per founder. I'm assuming here that there's only air travel costs and that founders can find places to stay for free while they're in town.

It may be that there is much more face-to-face time that happens because people are co-located, but I didn't the impression that the founders all work in one large room or anything similar.

Even traveling to SF or Cambridge for 2-3 days a week is something that I think people would be willing to do. I can even imagine looking forward to the time away from the family!