Concert promoter: Some critics claim that our concert series lacks popular appeal.
Conclusion
Critics are wrong; our concert series does have popular appeal
Evidence
Income from T-shirts and other memorabilia at our concerts is at least as much as that type of income for comparable concert series.
Evaluation
Given that the memorabilia income at this concert series is at least as much as the memorabilia income for similar concert series, how would we argue that this concert series does not have popular appeal? - We could say those other concert series aren't that popular either - We could say that you don't measure popular appeal by memorabilia sales - We could come up with some weird alternate explanation for why memorabilia sales are as high (maybe in our case it's not indicative of tons of people buying stuff, but rather a few people buying tons of stuff or really expensive stuff)
Goal
Tough to say where this is going. There are missing link assumptions that could be called out, and there are questions surrounding how fair a comparison this is. Look for stuff calling out a missing linking idea or raising an objection that would make the comparison feel like an apples and oranges one.