I just received an email from a fellow venezuelan that works in a travel agency. This is what he has to say:
No matter where you buy the tickets, you will have to pay local taxes. In CCS
you always have to pay:
-Airport usage fee: 61,750 Bs.
-Departure tax: 24,700 Bs.
You must pay this no matter where you bought your ticket. After you checkin you must go to a counter where you pay an airport official those fees and they give you a sticker that you must present before you board you flight. Hope this helps.