These founders all have products at least in beta. They are in various stages of funding: some are self-funded, some have angel investors, others have institutional funding.
How much money do you think you'll make from this (to see how they evaluate their chances and worth), do you want to sell or remain and make a salary (to see what they are building the company for - longevity or a quick flip, not that either are bad), and what do you see your retirement like?