FullNothingness
Mostly DHMO.
Oh that's very true that it'd be a waste of Taylor's time and energy, but that's because she's now filthy rich. Disregarding the Potter Vaults, Harry just inherited the entire fortune of the Black Family, who were obscenely rich even by Wizarding standards. Wizard fortunes seem to generally be pretty large if they're part of an older family simply because compound interest is a thing. The Weasley's dire straits seems to be the exception to the rule.
As for why I said Potter Vaults, it's because no sane parent would leave their family's entire ancestral fortune to a toddler if they were to unfortunately die. Lily at the very least wouldn't have allowed it. The vault we see Harry access in Years One and Two is very likely a trust vault and is just a small fraction of the total wealth in the main Potter vault. The Potters were likely just as wealthy as the Blacks, potentially more since they are descended from the Peverells who were around a long, long time ago.
Compound interest is possible... But keep in mind that those families were using that money. They may have spent the interest. And as pointed out that is assuming there is interest at all.
That said I do suspect there is more than one Potter vault. Because Harry's vault contains only money and no items unlike Bellatrix's vault IIRC. You'd expect the Potters to be storing at least something valuable in the bank given their situation. And if it isn't in the vault Harry accessed then it is probably in another.
But in the end my point was that spending time finding good investments was not a good idea was not based on how much money they have. Because small or large investments take time to grow your money. And the war is on right now. So regardless of amount the money they have is probably the money they can practically use now and investing would just cut into what they can spend now.