Dealing with "Unknown" equity % in ListSource

[Joshua McGinnis]

In generating my lists for the Cleveland, OH area, I'm trying to target high equity properties, but it seems that most of the leads have an "unknown" equity. This is drastically lowering the number of available contacts that meet my other criteria. 

How do you handle this? Do you deal with having a smaller, more targetted list that you can blast more often - or do you gamble on the unknowns - or do you include lower equity people to get your list count up?