I spent more fixing GM shortcuts in my Regal's body than anything else.
I never said the suspension problems can't be solved, but its expensive and labor intensive which is a turnoff considering you can buy newer used cars that (are) far better stock. Its not just tall ball joints but also redesigned arms that take advantage of tall ball joints. Plus your stated price quote is missing a zero. Any improvements in making the suspension stiffer simply makes the floppy frame and body flex more, requiring bracing and reinforcing. Tall ball joints and arms are just a drop in the bucket.
Look: I know TIE Pilot's never exactly been "the life of the party," but the guy technically always has a point.
Sure, you can do anything you want to a G body. But if you don't do anything then you're left with a rather sub-par product compared to what else is out there. Sure, they may increase in value. But there's also a reason why they're so cheap to begin with.
If a 1970 Skylark GS 350 is the Mona Lisa, then my 1987 Regal is me buying a canvas and paint and doing my best to copy it. And it's not hard to guess which one of those would go for more at an auction.
PS: I had to Google what the hell a Yugo even was.
This one looks kinda fun though...