All weapons are close to each other DMG/Pec wise, only range is more eco because you have less defence cost like armor and healing decay. Because mob has to get in his attack range. So that's the only reason why melee will be a little expensiver, nothing more.
It also depends on your hunting style and the mobs that you are hunting. If you are going for huge mobs that are going to hit you regardless. Then it will be cheaper to get the best dps and dpp possible whether it be melee or ranged. Regardless you will want a tagger and mid range dps with melee. So if the higher end ranged weapons are out of your price range than you might be better off with unlimited sword/knife/club and a melee VI amp, while using L weapons for some ranged dps.
also say you have a gun that will last you 1000ped ammo and has 300ped tt and cost you 115% to buy, then you'll pay 115%/300(45ped extra) and 1000ped ammo costs you nothing extra while using 1300ped in melee at say 105% will give you 65ped extra
allthough if you have unlimited stuff you'll have nice dps early on and some mad evade later in game