There's bad news for Jess Glynne fans: if you missed out on tickets when they first went on sale, then you'll face more outrageous markups on resold tickets than fans of any other star.
Credit comparison site TotallyMoney.com researched the highest resale price for a variety of current acts, to find out how much more their tickets sell for than the face value. Jess Glynne topped the list with an incredible 5028% price increase - with the most expensive selling for an eye-watering £1,000 on Stubhub.
At number two in the highest mark-up charts is pop playboy Justin Bieber, whose £45 face value tickets can go for £1,300: a 2789% increase. That's more than £1,000 for a standing ticket at the O2 Arena - so you'd better hope you're not behind someone tall.
And in third place is Adele, whose tickets can command a 2129% price increase from a face value of £95 at a staggering £2,117.75. Her tickets were the priciest on the resale list - because they had the highest face value in the first place.
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"Some artists sell better than others," says Joe Gardiner from TotallyMoney.com. He points out that while this is bad news for fans who don't snap up tickets in time, it can be good news for those who need to change their plans. He says: "If you time it right, you can make some serious cash for yourself if you put a ticket you don't want up for sale."
The price isn't the only thing you need to watch out for if you are buying a second-hand ticket. Online ticket fraud rose 55% last year and at least £5.2 million was scammed out of unsuspecting victims. These tend to be sold online - often through social media - and offer hard-to-find tickets that turn out not to exit - or that simply never show up after fans hand over their cash.
If you're desperate to get to a sold-out event, then your best bet is to buy from an official resale site approved by the event organiser - so you can be sure that the tickets are genuine and that you will get in.
If you buy from reputable resale sites, you also have some protections. Stubhub, for example, guarantees you will get your tickets in time for the event, and that they'll be valid for entry. If this doesn't happen, they will either try to source replacements or offer you a refund. They will also handle all customer service issues - so you won't have to negotiate direct with the seller to get your money back.
Clearly, however, these protections don't include any kind of guarantee that you won't pay enormously over the odds. But what do you think? Would you buy second-hand tickets? And would you pay 50 times the face value for them? Let us know in the comments.