People voluntarily taking a risk with their own money with the hopes of a return is the definition of "the market".
That is 'a' (rather than 'the') definition for market. It is extremely common nevertheless to expected the return for an investment to be monetary profit, not whatever you get in return. Else even NGOs and other non for profit institutions would qualify as "the market". So I'm ok with my use of "market" if most people get my meaning, which is the entire point of language and definitions IMHO.