Organisers of the sold-out LIVE AID style concert in CARDIFF are trying to block tickets from being sold over the Internet.
Dozens of tickets are being auctioned off on eBay for the January 22 gig, with some pairs going for more than £200, reports the BBC.
Many sellers said they would donate some or all of the profits to victims of the Asian tsunami.
But organisers at the Millennium Stadium are working to try and remove the tickets from eBay.
Stadium manager Paul Sergeant said: “If there is a way for me to identify who these individuals are and not issue tickets, then I’ll do it.
“If you don’t want to go [to the concert] yourself, don’t buy them rather than profiteer.”
But eBay said in a statement that the re-sale of tickets on the site was not illegal.
The statement read: “eBay only allows legal items to be sold on its website. The re-sale of concert tickets is not an illegal activity and is therefore permitted on eBay.co.uk..
“However, although it is legal to sell these tickets and money will already have gone to the charity via the original ticket sale, we would always encourage our users to buy tickets for fund-raising events through the proper channels to ensure the maximum benefit to the charities concerned.
“Also, of course, the fact that such tickets might be offered for sale on eBay does not mean that users are obliged to bid on them,” the statement added.
Ticket prices were originally set at prices ranging from £15-30, with all profits going to victims of the Asian tsunami.
Organisers are hoping to raise £1 million for victims of the disaster, which struck on Boxing Day (December 26).
The benefit gig is set to be screened in full on BBC Wales, and live highlights will be shown on BBC One and Two.