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I'm no electrician, but wouldn't you have to double the transistors in the circuit with a + and a -. So it seems to me like a negative benefit level... pun intended.

The main resemblance between a transistor and a diode is that, like a diode, a transistor will show a fixed voltage drop across it -- around 0.5 volts in the case of a germanium device, and 0.7 in the case of silicon. But I think I get what you're saying, a single transistor type, NPN or PNP, is only good for (relatively) positive or negative voltages, not both. Trinary/Ternary circuits do require higher transistor counts, all else being equal. A stickier problem is that it's hard to fabricate PNP and NPN transistors which have similar enough characteristics that they would work together without any performance penalty.

i can't tell you youll steal it