I vaguely recall donating a bunch of cheap, old, dogbreath pickups to one-time forum member, Left_Hand_Strat. He was going to unwind the copper wire from them and use it to experiment with building his own new pickups. I have no idea whether he went through with the idea.
Dispose of your cheap PU's at your own peril. I've seen a lot of guitars sold with expensive, upgraded PU's that didn't sell for a dollar more than if they had the cheap stock ones (probably because the seller threw out the old PU's). They're often a 'gift' to the buyer.