...figuring that no one else will ever stumble upon it...
Except the next person to inspect or perform work on the line.
On another note, the guy just happened to be able to acquire a transformer capable of dropping the voltage to a usable level? Either had a lot of money saved up or used some "inside sources"... Not many companies who would sell something like that to a single consumer, though I suppose anything is possible.
To clarify, I'm guessing these were medium voltage (1kV to 33kV) not the "high tension" pylons we usually think along the lines of hundreds of kV, since I highly doubt there's a single transformer capable of dropping from 100kV all the way to 208 or 240 in one go.