B727 CREW AT RNO STILL QUESTIONS ACCURACY AND INTENT OF DISPATCH AFTER TKOF HIGH ALT HOT DAY AND LONG TKOF ROLL.

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THE PROB AROSE DUE TO THE B727 BEING SCHEDULED INTO RNO ARPT AND OUT ON A NON STOP FLT TO DTW WITH OVERSOLD SEATS. THIS REQUIRED CERTAIN AMOUNT OF FUEL TO REACH DEST AND A DENIED BOARDING OF PAX DUE TO WT RESTRS. THE COMPANY OBVIOUSLY WANTS TO CARRY AS MANY PAX AS POSSIBLE UP TO MAX CALCULATED WT. I QUESTIONED DISPATCH ABOUT HIS DENSITY ALT PROBS AND DISPATCH AGREED TO LOWER MY FUEL LOAD AND GAVE ME A NEW RELEASE TO THIS EFFECT. HOWEVER; I WAS TOLD BY MGMNT IF MY FUEL WAS REDUCED MY PAX COUNT WOULD GO UP TO MAKE IT STILL A MAX GROSS TKOF. I THEN INFORMED DISPATCH THAT I WOULD RATHER TAKE FUEL THAN PEOPLE BECAUSE IF I HAD A PROB I COULD DUMP FUEL WT; BUT I WANTED TO TAKE LESS PEOPLE VERSUS FUEL. I GOT RELEASE #3 WITH LESS PEOPLE; ORIGINAL FUEL. I CALLED DISPATCH BACK AND LET THEM KNOW I WAS NOT HAPPY WITH THIS DECISION. THEY ASSURED ME THAT EVERYTHING WAS IN COMPLIANCE -- EVERYTHING WAS GO. TURNS OUT THAT WE ALMOST FLEW THROUGH DEP END APCH LIGHTS DUE TO POOR PERFORMANCE. IF ANYTHING HAD HAPPENED; IE; ENG FAILURE; WINDSHEAR; DUST DEVIL; ETC; THIS COULD HAVE BEEN A CATASTROPHE FLT. I FEEL THAT THE NEED TO FILL PAX SEATS NEGATED THE LOGIC AND ADVICE BY ME AS THE CAPT AND I WAS SOLD A BILL OF GOODS THAT THE ACFT WAS WELL WITHIN GROSS WT/ALT PARAMETERS FOR A SAFE TKOF WHEN IT WAS NOT -- AND A VERY DANGEROUS TKOF AND LOW DEP RESULTED. I FEEL THAT A HIGHER PERFORMANCE ACFT SUCH AS B757 SHOULD BE USED ON THESE HOT MONTHS OPERATING FROM RNO-DTW. OR MORE OF A SAFETY MARGIN SHOULD BE ADOPTED.