Venture Capital investment in Bitcoin has been fairly massive - and from many top tier VCs e.g. a16z, USV & Accel (but notably not Sequoia nor Greylock). Some key investments: 75m for Coinbase, 20m for Xapo, 9m for Circle (still haven't launched) and many smaller investments.
VCs have also been putting massive amounts of money in to BTC itself.
If Bitcoin fails, SV will collectively look pretty silly. Its going to be interesting to see what happens when either the US economy takes a dump, or interest rates rise and VC funding dries up...