Yes it's pretty expensive to take a trip or fly to Tahiti as it's very hard to get too and there's not many flights going there.
A flight to Tahiti is limited so you can expected to pay around $1,400.00 to $2,000.00 for the flight to Tahiti and then the hotels which are also few and very exclusive cost around $400.00 to $1,000.00 per night.
So you do need to have some money saved up if you want to go to Tahiti.
I wish to go to Tahiti myself one day and it's on my bucket list to go to before I die.