I'd like to enter the contest and also raise the pot, but first, clarification on rules; Are you saying that it must produce (at least) 100w continuously for 100 days, or just verified 100w instantanious once per day?
I live in a low wind area. Some rare days 5-10mph, and more often 2-4mph and not constant at all. It may take years to come up with 100 "good" wind days. See where I'm going? At what point and who will determine a winner?
I'll add another $100 to the kitty "if" the whole thing is made from either found scrap or landfill bound material- all of it. Rotor, wire, magnets, bearings/hubs. Only thing that can be bought is hardware- nuts, bolts, washers and screws. Use your imagination. Wire can come from crt monitors, microwave transformers, or induction motor"unwinds". Magnets from hard drives, microwaves, old speakers etc. I'll make an exception for stator potting material, which can be purchased.
Expect cheating. This is a contest with prize money. AND there are engineers involved. :-)
David