By Seamus Duff Adele has enraged her European fanbase after the sky-high cost of tickets to her upcoming summer shows were revealed. The 35-year-old Rolling In The Deep singer is to play a string of concerts in Munich this August – singing outdoors at a bespoke open-air arena large enough to fit 80,000 fans each night. But it seems the fans that will attend will need to be flush with money as tickets are being flogged for almost £1,000. Fans had to register for tickets to the concerts – with general sale tickets finally becoming available last Friday. But many have been left balking at the cos…