Lift repairs and who pays

I have a friend who lives in a complex of eight units in Brisbane, and they're currently faced with the prospect of issuing a special levy to cover the costs of replacing a lift motor.  This is going to be in the region of $8k per unit.

I've heard of similar levies being distributed across units according to lift usage.  That is, apartments on the ground floor who don't use the lift at all pay a far smaller proportion of the overall levy than those on the top floor who use the lift daily.

Does anyone have any experience or insight (from a Qld perspective if that differs to other states) into how this usually works?  I understand that levies are usually divided according to unit entitlements, but that would seem a little unfair to me in this particular situation.

I appreciate any assistance.