Now don't add empty route synergies when you play calculation. IR deployed clones in limited demand sector and that's their issue (even that's been extra charged). You cant push regular train service in name of special & charge complete rake as Tatkal.
Coming on your point, in Festive season, when these special will run with full capacity, the vacant left out will be wrong Indian Railways choice & opening reservation in Special Trains at last moment will help touts to make money (along with IR) & why i should be overcharged for regular service as Special (which isnt vacant against high 3A & low SL with limited stop overcharged Humsafar Clones)!!