more seriously, I have noticed, in the years since 2007 when I first bought an apartment here, that cuevas, in general, have been declining in both quantity and importance. Instead, anybody with any real money uses exchange agents whom you text, and they deliver your desired currency to you in private. The cuevas in my neighborhood are pretty nickel and dime, mostly. You need to call ahead if you want to do a transaction as "small" as $1000 USD. They serve mostly the lower middle class, often doing deals under $100USD. They certainly serve a purpose, and are essential to many many people, but in larger economic terms, they are more like Kioskos, not Hedge Funds.