As a price point.
I tired to sell this car for a friend,
http://forums.pelicanparts.com/porsche-cars-sale/996241-1977-911s-targa.html
Similar to the car you described , mid year with good later engine, except this car has a glass out paint job with no rust.
Bidding on bring a trailer only went to 24K and Ebay went to 24.5K
No bites from ad on pelican at $31K