The current heat in the startup market is largely due to the Fed pumping money into the economy by setting interest rates so low that large institutions can borrow nearly for free.
While most of that money is going into less risky things like firms who are expanding rather than contracting thanks to the supply of capital, lax regulatory landscape, etc.
The extra employment and associated consumer spending, along with the optimism obtained from a large number of people feeling like "owners" thanks to crowdfunding programs, helps create a culture of ideas and optimism.
And of course if you're rich enough you want to have some money in some highly leveraged, risky bets, and so VCs and LPs are refining that market substantially, helping money flow into it efficiently. Mattermark is an example of serious analytics to help with deal flow that is growing in number of deals far out of proportion to the total dollar amount.
Similarly, "financification" is happening in areas of real estate that have previously been slower markets driven by insider knowledge and minimal transparency.
Financification is actually the broader trend. Companies like Mattermark realize that and are applying it to what they know (startups) but it's also being done at Farmlogs, Reonomy, and many, many others.
Such businesses are pro-cyclical in that they lose value if deal flow slows, not to mention the inevitable liquidity assumptions that underly all such predictive analytics.
I think that the financial instruments needed to truly make these things work medium term are obscure or even banned, so it will be interesting to see how that plays out.