The unofficial resale method isn't illegal but the ICC has at time cancelled such sales during the tournament, under the terms and conditions. They claim to be doing this to protect spectators.
"Anyone purchasing tickets from an unauthorised source, either online or in person, faces the risk of being left out of pocket and unable to enter the venue," the ICC stated.
Ironically, India's fervent enthusiasm for cricket is at the heart of the issue. When the tickets were made available in a priority ballot more than a year ago, the uptake from Indian supporters was six times that for English fans.
CricInfo also said there had been a problem with non-attendance by people with sponsors' tickets, adding to the likelihood of empty Edgbaston seats.