An owner can certainly ask the committee to seek more quotes (although these figures are from March so that ship may have sailed). Also, you don’t know what the strata manager has communicated with the committee before they settled on this quote.
All that said and done, the strata manager is required by law to notify owners of any commissions they have received or are likely to receive (usually via the annual report for the AGM). And they must also seek three quotes for insurance or explain in writing why they haven’t.
Here are the relevant sections of the Act:
(1) A strata managing agent for a strata scheme must report the following at the annual general meeting of the owners corporation for the scheme—
(a) whether any commissions or training services have been provided to or paid for the agent (other than by the owners corporation) in connection with the exercise by the agent of functions for the scheme during the preceding 12 months and particulars of any such commissions or training services,
(b) any such commissions or training services and the estimated amount or value of any such commissions or training services that the agent believes are likely to be provided to or paid for the agent in the following 12 months.
Maximum penalty—20 penalty units.
A strata managing agent must provide the owners corporation with not less than 3 quotations from different providers for each type of insurance proposed by the agent to the owners corporation or provide written reasons to the owners corporation if less than 3 quotations are provided.