Random question and more or less curiosity.
So I understand how an index is created (or priced might be a better way to put it).
How do these indices actually get popularity and traction?
Do the creators actually earn money from 'selling' the index to an ETF type manager?
Such as say the ETFs that track a certain index currently. Or do they basically just track the same companies within the index and don't have to pay for any form of licensing?