The return of Oasis, the chart-dominating bad boys of ’90s Britpop, has been one of the biggest stories on the music beat this summer, with a slate of surprise reunion shows in Britain and Ireland selling out instantly over the last week.

But the rush also introduced many fans to the frustrating vagaries of online ticketing, where the prices are not always what you expect (and they usually go up).

Last weekend, after the first batch of shows went on sale, angry Oasis fans took to social media to complain that many tickets that had been advertised at 148 British pounds (around $195) ended up more than doubling in price to £355 (about $468) by the time they went to pay.