Big asterix in the Rex Community Fares arrangement for this port ...
BHQ - SYD - BHQ is valid for Community Fares (non-stop)
DBO - SYD - DBO is valid for Community Fares
BHQ - DBO - BHQ is NOT applicable for Community Fares
Therefore, for the past period whilst Rex insist on routing via DBO, you may be paying approx $150-250 for the SYD-DBO leg, and then $550 + for the DBO-BHQ leg.
Last week, flying out of SYD (to BHQ via DBO) on Sunday afternoon, there was another SYD-DBO flight which departed approx 15 mins earlier.
The funny thing though - upon landing at DBO, 2 pax off, and 3 pax on.