I very much disagree.
If I am willing to pay the asking price for tickets, I should be able to buy them. If you're offering them so cheaply that I will happily buy all of the tickets then you're offering them too cheap and you can't really complain if I buy them.
If it weren't for ticket-scalpers, die-hard fans who are willing to pay extra to secure a place would have no option. Thanks to ticket-scalpers, it is possible for die-hard fans to ensure they can get one even if the tickets are "sold out" by just offering more money.
This is a classic case of an inefficient market being made more efficient.
Without ticket scalping: the original seller sells all the tickets. Some fans get to watch the gig, and others don't, and the availability of tickets bears no relation to how much you're willing to pay to get hold of one, only to how quickly you decide to book one.
With ticket scalping: the original seller sells all their tickets more quickly. The fans who want to see the gig the most get to see it, with less chance of tickets being made unavailable by people who don't want to see it as badly (i.e. don't want to pay as much money), and the ticket scalper makes a profit. Everyone's a winner.