Well that's the thing, as part of my checks I'm looking at citation and trust flow. if trust is really low then i'm not going for it. Just looking at the profile will probably reveal stealth link injections, or pharma-type links.
That's why just hunting for PR domains isn't efficient, so I agree with you.
The good thing is that most people just look for PR, or even sort the results by PR, and they're missing out on so many great domains because they don't spend the time to research.
I've been able to find a domain, check everything, confirm its quality, buy it, set up free hosting, install WP with a pro theme, and upload some of its old pages all within 45 minutes.
Within 2 days Google has crawled it again and PR has shot up to 4