> its the lack of investments that give a real return
The stock market has provided a tremendous real return over the decade since the great recession. And it's dramatically safer on average than venture capital. Let's say you waited until the market got back to the old highs (call it mid to late 2012), to put your money into an S&P 500 index - you're up close to 100% in a little over seven years, or 9-10% per year, an amazing return by historical standards, for doing nothing.
So no, it's not the lack of investments offering a real return. It's caused by the extreme scale of wealth outstanding now. That wealth isn't overall that desperate for a return, that's why so much of it has piled into government debt yielding zip, and only a tiny fraction by comparison flows into VC. The VC being deployed has scaled with the increase in the pile of wealth in the US and global economy broadly.
This is just a tiny subset of wealth seeking a very extreme return in exchange for taking on a lot of risk, not just seeking a good or great (what I think you mean by real) return. They're chasing an Alibaba, Facebook, Google type homerun. It's the literal thing that lured all that money into making a bad bet on Masayoshi Son's fund, his Alibaba riches. It's a diversification into lottery tickets, because hey, you could be a winner, you gotta play to win, only a small number of these lottery tickets are sold, and you know the people that control access to all the tickets.