If you buy the Plus or Premier Cruise Package aboard the ship in Australia/NZ, it's the Australian/NZ package and daily crew appreciation is not included in those packages - and the lower price reflects that. ($65aud being approximately $42usd, give or take some change. Or, approximately the difference of upper end crew appreciation per day).
If you bought the package before you leave, ie in advance of sailing, at the USD $60/80 price, it'll include the daily crew appreciation...but you wouldn't be able to use OBC for it.
No package - yes, daily crew appreciation is charged aboard.