prices vary pretty wildly. If your boat goes via any troublesome areas you will need a responsible skipper
and the delivery may be more expensive than an easy tradewinds stunt. Your best bet to arrive at a fair estimate is to ask DETAILED quotes from selected skippers. Then you can compare the quotes with ship freight cost.
Here you have two real life 2011/2012 examples of delivery prices (paid, not asked), one was an easy sail, the other a bit more intricate case:
a) 40 ' the EU to West Indies - USD 3.5k,
b) 60' Australia
to the EU - USD 25k,
Both cases are ex boat costs (marinas, fuel
, etc.). The West Indies crew got tickets back home (to the EU) paid by the owner.