“High-quality leads” and “low-quality leads” have been sales terminology forever. Put your pitchfork away.

I always think of Glengarry Glen Ross when I think about high and low quality leads.

The leads are weak? You’re weak!

They could sell ketchup popsicles at a white glove event?

I suppose getting people to do things against their better interest is a very people thing to do.

Isn't that the movie where it at least smells like fraud?

That's what he should have said, then.

A cursory scan doesn't turn up anything derogatory about that term, it came about 20 years after "black book". Whitelist doesn't appear worthy of an etymology, but my amateur supposition is it's merely the opposite of the phrase "blacklist"

Sometimes a spade is just a spade.

Might be better to say high / low quality SALES opportunity.