Listsource - Some Equity, No Equity or negative equity

[Martin Sterling]

Greetings 

What is the level of Equity that you choose when getting leads from Listsource or any other source. I've heard some people say equity, others no equity, yet others a little equity. What does it mean to target each?

Also, I've heard someone on here say purchase properties that have loans originated before 2007. Does this make sense?

Thanks in Advance