You can do exchanger and earn something with it
becoming an exchange is an easy job because you're just selling and buying bitcoin, certainly rate will be slightly different from the existing Exchange site because you would surely benefit you certainly will add to the existing rate, but to become a famous exchange is a difficult thing
Yes, that part is the easiest, but how about the trust ? I mean, to be exchanger you need trust from the costumer because for the new exchanger is a bit hard to get costumer.