There are two approaches used when considering whether to restore a car:
 
1. The Logical Approach
Will it be even vaguely worth the $$ I need to spend on it, incl purchase cost.
 
2. The Suffer-For-Your-Art Approach  (aka Hip Pocket Trauma Syndrome)
Logic is out the window,
no one can convince you of the folly of your pursuit,
and some even insanely agree with you (i.e. they want one too! Preferably yours....)
 
Browse the UK sites and read their magazines. 
It's truly amazing what some people think is worth saving.  I do know people ship rusty Escort Mk1 shells back to England, because at least most of it is still there, and not just red dust on the floor.

The way I look at it is if I am going to respray a car, then it will have to go back to bare metal and I will probably find lots of bog and chicken wire anyway, so ones that are just covered in surface rust are not that much more work but can be bought a lot cheaper.  Same for the interior, most cards are no good so the cost to start with nothing is not much more. 
 
Ones with big holes like in the OP are a different story, but I prefer so see them broken up for donor parts to help save another rather than just scrapped.
 
My capri is painted, rego'd and drivable, but is worse than the MG, its full of bog and fibreglass - I put it there when I was young and stupid. Now I am older and still stupid I will do it right this time....soon I hope.

Got the message Spud15. That is serious rust. Not too many panel beaters willing to tackle a job like that I suspect. Even less owners willing to pay the price. RIP Capri

well its a 70 model (i think) so if there useful ... Actually, im hoping the engine, box and diff will be good - turns over nice.. Its a very low km car)

well i will be resurrecting it (after ive finished all of the others). - scored another v6 rolling shell for it  and in original jewel green