Haven't heard of index investing, is this like index funds investing? Because if it is index funds then I agree with you, that's probably the only reason that you should consider putting money in the bank because they're definitely a good passive income for you, maybe the only problem is that it's still in the bank but you can never really worry too much about it but then again the passive income potential of index funds is just too much to pass up if you know what I'm saying. DCA is definitely the most recommended thing that you can do when you're investing in bitcoin given how expensive it is, you're going to be in a good standing if you do this DCA routine for the long-term that would mean that it's going to yield you profits you can never imagine.