..The two blades just double the contact area...
Correct - when dealing with voltage, you are dealing with resistance - and resistance, to simplify, can be considered as a funtion of available mass. (Thus, 12-gauge wire handles more current than a 14-gauge wire, with the same 'resistance factor'; or, alternately: 12g offers more 'leeway' than 14g... assuming 14g is spec'd to handle said (assumed) load in the first place... *Grin*)
Alas, however, I fear we are wandering a touch O/T - judging from the OP, we are well and truly below a point where any such consideration would possibly become 'non-trivial'.
No, my friends; in the here and now, we are discussing...
Æsthetics!(*Grin*)