TNA has issued the following statement about the European tour in late January:
"The IMPACT WRESTLING World Tour events in Essen, Leipzig and Neu-Ulm, Germany, have been canceled. Tickets can be refunded at point of purchase."
Shooter Promotions, the local promoters for the now canceled TNA Germany dates later this month, sent out a statement, which translated to English, reads:
"Due to the unexpectedly poor clearance sales, the planned three TNA Wrestling shows are canceled. The already purchased tickets can be returned to the respective box offices."
So, it was low advance ticket sales that caused the dates to be yanked.
Source: the outstanding www.pwinsider.com