Just my opinion but...why do you keep buying them then? If you dont buy these bikes to keep or fix, why put yourself in a situation where they either have to be quickly bought whole or else be put on a chopping block?
Unless, you're saving them from a worse fate (junkyard) by buying them in the first place, I would just leave them for someone else to find and treasure. Not that it's not helpful to the community that you're finding them, but it sucks to see whole bikes parted. (edited)