In his feature on Java Jazz (in Bahasa Indonesia), Bre Redana of Kompas wrote that people came to see something he called the ersatz jazz --or the not-so-really jazz, the likes of James Ingram and Babyface. Reading it, you could not avoid a glint of satire and his mock to Jakarta lifestyle.
My take: if those ersatz jazz make Jakarta urbanites willing to pay hundreds of thousand IDR so that the organizing committee could pay Joshua Redman (as in 2007) and Wynton Marsalis (probably in 2009) to play, bring them on.
Imagine in the next year Java Jazz, those people crowd into, say, Rihanna's stage, and the jazz addicts enjoy The Lincoln Center Jazz Orchestra in less crowded, thus more pleasant, performance. Better yet, if the former pay additional special rate, while the latter regular.
In economics term, it's called a Pareto improvement.