That's a valid concern, but it is solely founded in a capitalistic point of view. For some people there is no more to life than raising their personal net worth, others have other aspects.
I don't think the point is capitalistic - others (above) have made similar points to this one. Many business and social activities are enriched when most participants are present.
This wasn't about money. Markets, in general, refer to exchange of things that we humans value. Since exchange is voluntary, both parties benefit. Liquidity means having someone around to have that exchange with.
Economics is much more than simple allocation of money. It's fundamentally about human wants and how to satisfy them.
