I'd consider $500 to be a reasonable offer, if it saves me the work of having to take it to a scrapyard. I don't have the time to give it to someone. A $1500 s130 won't have good compression, and requires the buyer to have space for an extra car. The only offer I've received was $1000 delivered, and that's not even a remote option.
The Datsun Parts group on Facebook is more active than classifieds here or Ratsun, and I've had the same post on Craigslist. I imagine KS has a pretty different market for parts than New England does, I believe I know every member on here, classicZcar, and Ratsun within 200 miles of me on a first-name basis. Craigslist is pretty dead for car parts around here, unless you happen to be looking for hellastance wheels with motorcycle tires on them because swag.
While I'm not opposed to donating (I've been a donating/supporting member for most of the time I've been a member here), it's another barrier to entry. I'm strapped enough for time that any of those barriers to entry make me question whether or not the result is even worth it. In this case, I decided it's not.