I don't trust List Source %Equity

[Nick Hill]

Ok, so I'm building an absentee owners list is a small affluent college town.  The number of undefined leads in my geographical area is 38K. I whittled this down to about 3,000.  I then added 40-100% equity and I get a whopping 150ish total leads for absentee owners.  I am suspect... 

For kicks I changed the equity parameter to 1-100%.

According to List Source, out of my total geographical area (38k) there are only 10k properties with 1-100% equity.  When I add my other parameters the grand total is 299 leads with 1-100% equity.

Am I missing something?  Should I just use "Last Market Sale Date" >7 years instead?

Thanks.