The state will tell you there is no specific definition of substantial consideration and each case will stand on its own merits.

There are ways to properly terminate such a contract and Greg's Plan B answer has some merit to it. 

Major violations can snowball, just look at each on its own merits. :) 

When I was in boy scouts we did this as part of a merit badge.

This is not a debate for or against the merits of carrying a gun.

Or is it wise to let each property "pay itself down" on it's own merit, so to speak?

You've got someone on the outskirts of socially acceptable behavior, she might have merit for it (hiding from a harassing boyfriend), she might just be anti-social, she might be hiding a meth lab.Regardless, I would want to stand in front of her and talk to her and get a feeling for her situation.

On its own merits, Campbell's arguments are insufficient.

I've been reading online and it seems that you can start to wholesale without a lot of cash, is there any merit to this?

I didn't mean to turn this into a discussion of the relative merits of brokers and wholesalers.