Yeah the article pretty much makes no sense. He doesn't have any substantial figures. All he says is that one website listed tickets online at a reduced price and even then he has a pretty massive gap to work with. Between 1,400 and 11,000 tickets? That's why too large of a figure to even hold credibility. It more or less just masks the fact that he doesn't know how many tickets were sold and how many people bought the cheaper tickets.
He has no information on how many people took advantage of the offer which is the most important information in the story. If your going to say Britney's tour is in trouble you need to have that kind of information. Not to mention that these could just be scalpers looking to make a few bucks but got unlucky.
He basically made an article over the fact that there are cheaper tickets on Groupon.
The only way we will be able to tell how the cheaper tickets effected the tour is when we get tour grosses, which LiveNation or whatever tour promoter she is under will release when they see fit. He gave little to no actual information. Not here for that.