This was 2007, but Paul Graham describes Boston VCs as being slow to act, so they stopped doing Demo Day out there.

http://www.paulgraham.com/startuphubs.html

TechStars hasn't had a problem. Boston cohorts have raised ~$400 million in VC so far: http://www.techstars.com/companies/

YC used to be in Boston for half of the year:

http://old.ycombinator.com/ycca.html

True, but from what I know, it's much more of an old-boys network rather than any kind of stranger to stranger demo based conversion. People trying to make it that way tend to flop here, as there aren't many venues.