Things started to go south for Jackson’s trek – a 2-and-a-half hour, hits filled production that covers her nearly three decades in the business – when she reportedly became ill and was hospitalized September 29, just prior to a show in Montreal.

Since then the singer has pulled the plug on eight other shows, including Boston; Philadelphia; Atlanta; Greensboro, N.C.; Sunrise, Fla.; Uncasville, Conn; and Verona, N.Y. – all of which are expected to be rescheduled – and an October 16 New York City stop that was already moved to November.

An October 15 show at Verizon Center in Washington, D.C., is still scheduled to go on as planned, according to the venue’s web site.

While no specific explanation of Jackson’s illness has been released, Live Nation, promoter for the tour, has said that she has been under a doctor’s care and is expected to continue the trek.

The singer’s brother Randy allegedly explained last week that vertigo is the cause of the trouble, but several media outlets, including ABC News have begun to suggest that ticket sales are the problem.

A former spokesman for the Jackson family told ABC that poor sales have prompted Live Nation to pull shows and went on to speculate about the ability of the singer to compete with younger artists like Ashanti and Beyoncé.

Attempts by Pollstar to contact Live Nation for comment were unsuccessful.