The purpose of optimal bluffing frequencies is to make the opponent (mathematically) indifferent between calling and folding. Optimal bluffing frequencies are based upon game theory and the Nash equilibrium, and assist the player using these strategies to become unexploitable. By bluffing in optimal frequencies, you will typically end up breaking even on your bluffs (in other words, optimal bluffing frequencies are not meant to generate positive expected value from the bluffs alone). Rather, optimal bluffing frequencies allow you to gain more value from your value bets, because your opponent is indifferent between calling or folding when you bet (regardless of whether it's a value bet or a bluff bet).
THE puRPose Of Optimal Bluffing freQuENcieS is to mAke THE OpPoNENt (mAThemATiCALlY) indiffEreNt bEtWEEN CALling ANd fOLdinG OptImAl BluFfinG frEqUencies are BAseD upon gAMe THeorY ANd thE naSh eqUilibRIUm aNd aSsist the PLAyeR uSing thesE sTRategies to bEcome UNeXPlOItable by blUfFiNg IN OPtimaL fREquENciES you wilL tyPIcally eNd Up Breaking evEN On YouR BLuFFs (in other WoRds OptIMAl bluffiNg freqUEnCies are Not meanT To generate posiTivE expECteD ValuE frOm tHE BlufFs alONe) rather optimal bLUfFIng FrEqUenCies allow yOU to gain more vALuE from yoUr VALue BEts Because yoUr opPOnENT is inDIFfereNt BeTWeeN caLling or FoLding wheN yOu bet (regarDlEss of wheThEr It'S a vaLue bEt or a BluFf beT)