No because that would be stealing. Why is it so difficult for people to just be decent? It may not be illegal in a lot of places (yet) but it is unethical. And it promotes a black market and organized crime type of mentality.
Look at it this way; let's say Tony and his friends decided they wanted an easy way to make money, so they go to the local Safeway, Kroger, A & P or what have you and buy up every ounce of meat in the store. They do this day in and day out. They are the first 'customers,' when the doors open. Then they set up little road side stands to 're sell' what 'belongs' to them in the name of 'capitalism.' Now when you want meat, you pay Tony and his friends five times what they paid at the Supermarket. It's not illegal. They got the meat fair and square. They're just trying to make a living, like anyone else. If you want meat, you pay. Otherwise, you do without. Some people are rich enough not to care, so they pay. Others are just stupid, so they pay. But a lot of people just can't pay. They only have so much income and they just can't afford Tony's prices. Tony's doing great, but the community at large, suffers.
Besides, if someone is going to be paying $250.00 or more to see Billy Ray Cyrus' daughter jumping around the stage in an assortment of wigs, why isn't she the one making the money? She's the attraction, but in the scalpers scenario, she's getting the shaft just as much as the person paying for the over priced tickets.