If you use USD and want Yen you don't necessarily have to exchange them. You can start working for Yen. It's the same with bitcoins. You don't have to buy them you can just start services to earn them. I like it better because then you don't have to give out your ID to some online company!
I agree to the visual representation you set. Becasue like bitcoin there is a lot of other crypto-currency out there in the market and there is also a allotted stock and value in the market that peoole could technically buy bitcoin for. Yet if you don't have enough money to o buy it might be hard for you to buy bitcoin. So the best thing to consider is to fund ways for you earn.