>But all things being equal, investors would like their money allocated into projects with the best returns. Borrowers of course would prefer that they get the money so that doesn't really tell us anything, but society as a whole would rather that worthy projects are funded rather than a linear city in the desert or whatever.
you are describing the process by which competitive "jostling for the best returns / cheapest capital sources" produces market efficiency, which makes it pointless to try to find better returns or cheaper capital. Not having to think about that is a reward itself. The price of oil is established by auctioning off more oil every day; if you buy some at an auction, you're doing the best you can do, there is no better place to invest in oil, you can focus on driving your fleet of delivery trucks.
you are describing the process by which competitive "jostling for the best returns / cheapest capital sources" produces market efficiency, which makes it pointless to try to find better returns or cheaper capital. Not having to think about that is a reward itself. The price of oil is established by auctioning off more oil every day; if you buy some at an auction, you're doing the best you can do, there is no better place to invest in oil, you can focus on driving your fleet of delivery trucks.