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Actually, storing the whiskey in the bottle will not increase its quality. Before they are bottled, they undergo a process called aging. You can read more about it here

I didn't say anything about increasing its quality and this article is about whiskeys that are already bottled.

I just keep it in a dark cabinet that doesn't get hot, though I also have fairly low humidity here.

if you started buying $100,000 bottles then you start needing vaults and climate and temperature control and insurance and such, that has to eat into your margin. You don't want to drop a case of those and not have insurance. Or find that teenagers had a million dollar party.