I doubt it's legal, couldn't be used, but if you don't disclose it to anyone I wouldn't see the harm.

This way if you don't find a buyer in a week or two its no harm no foul and you walk away.

The REI business is not worth putting yourself in harms way.

Hi Raymond, if it keeps you organized and it helps you in any way without harming the process, it's a good idea.

My response, without being argumentative, is that If I am completely honest and upfront with the seller  from day 1 and they have no problem with my deal structure then there is no harm to anyone.

Yet your website is all full of self congratulating fluff and no substance.

My fat fingers do more harm than good on this galaxy S5......damn!

Causing harm to another party or acting in a tortuous manner.Having greater knowledge and or experience which leads to a transaction where the disadvantaged acts to their detriment beyond what a prudent person would do.Providing misinformation as a basis for financial gain.Manipulating circumstances or terms where another has fewer or no other choices or alternatives but to act under duress or causing some disadvantage.Providing terms or conditions that limit another to act in their best interest or restrict them unnecessarily.Placing another party in a position where they are required to perform where they have an inability to perform or where there is an impossibility for the to perform. 

Can't do any harm for the house prices. 

Worse off they could say it harmed their health and was hazardous.