CAPT OF B757 RPTS COMPANY DISPATCHER FAILED TO GIVE ADEQUATE ATTENTION TO CONTINGENCY FUEL WHEN DEPARTING FROM SEQU.

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THIS IS RECURRING PROB AND OTHER CAPTS HAVE VOICE SIMILAR CONCERNS TO DISPATCH AND MANAGEMENT. TO MAXIMIZE THE FUEL FROM SEGU TO SEQU; DISPATCH DOES NOT PROVIDE SUFFICIENT FUEL TO SAFELY OPERATE THE FLT. OFTEN THEY FAILED TO TAKE INTO CONSIDERATION AN ALTERNATE (NOT THE CASE ON THIS PARTICULAR FLT); BUT; SEQU IS A SINGLE RWY OPERATION WITH ALL TYPES OF TFC USING THE ARPT. THE POSSIBILITY OF AN UNANTICIPATED RWY CLOSURE IS HIGHER DOMESTICALLY. IN THIS PARTICULAR FLT; I WAS FLT PLANNED TO BE DISPATCHED WITH A 15.8 LBS OF FUEL. THE BURN TO SEQU WAS 4.3. ARRIVING AT DEST WITH 10.8 IN THE EVENT OF A DIVERSION TO SEGU (BURN OF 5.4); WE WOULD ARR AT 5.4. SEQU IS A CAPT'S ONLY ARPT WITH ONE RWY AND ONE APCH. MISSED APCHES AND GO AROUNDS ARE MORE COMMON THAN MOST ARPTS. YOU CANNOT EXECUTE A MISSED APCH TO A VISUAL. HOW MUCH FUEL WOULD WE HAVE TO EXECUTE A MISSED APCH? HOW MUCH FUEL DO WE HAVE FOR AN ATC DELAY? HOW MUCH FUEL DO WE HAVE TO HANDLE AN EMER? I ORDERED AN ADDITIONAL FUEL UPLOADED OF 3.0. WE SHUTDOWN WITH 13.3. THE LIMITED FUEL IS BASED ON AN EFFORT TO MAXIMIZE THE FUEL. ALTHOUGH; THIS IS IMPORTANT TO REMAIN COMPETITIVE IN THE REGION; IT SHOULD NOT OVERRIDE COMMON SENSE AND SAFETY.