Minuette, your average unicorn, is actually not that average. Someponies just wish she was, though... because then they probably wouldn't be trapped inside Canterlot's time corridor with a maniacal, time-addicted unicorn...
When Twilight returns back to Equestria after her time in the human world, she learns she lost something very important. Two things, in fact. Once you go hands, you never go back… for other appendages.
Bizarre comedy disguised as something else. Humans are being transported to Equestria through no fault of their own. The only polite thing to do is to help them settle in, and that includes trading in their old money for Equestrian bits.