I think one issue is the desire to have the least amount of weight at the top of the tower. Thus, there is no typical, real good, American, over-engineering of the generator...meaning that it's made as light as possible. Could be wrong, but I'm pretty sure that's one of the issues.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."