A high quality lead.
A high quality lead for something that's a bit harder to get.
Let's say a debt relief offer.
What happens when the person fills out the offer?
The users information is usually automatically sent out to a broker of debt collection companies. That broker may be paid $3-10+ per lead depending on how much in debt the person(s) are. He will be paid from various debit collection companies, and that broker may have 2, 5, 10, or even 20+ companies.
The more the person is in debt the more the advertiser will make.
So let's say there is 10 leads that the leads are $2,000-$5,000 in debt, that's quite a bit to the "everyday person" and those who are in debt are egar to get out of debt. So that 10 leads would be good quality leads, but now on the other hand, if those same 10 leads where $20,000-$50,000 in debt, they would be a "high-class lead" depending on the specifications of the offer/advertiser and the advertisers debt collection broker(s) because they would make the advertiser more money depending on the TOS they have with the debt collection companies.
Hopefully that cleared everything up a little more for you. If you have any other questions, feel free to ask me.