FC Groningen is practicing at the Langeleegte in Veendam against Wrexham AFC. What makes that opponent so special?

A reasonable 12.50 euros asked FC Groningen for the practice pot against Wrexham AFC in the Langeleegte in Veendam. However, individual tickets are sold online for much higher amounts and many enthusiasts are still looking. Why do so many fans want to go to a friendly match against a team that comes to the second English level?

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